# Mersey-class trawler

The Mersey class was a class of Admiralty naval trawlers built for the Royal Navy (or other government institutions) prior to World War II. Admiralty meant they were built for military service as opposed to conversions of existing boats. The majority of the vessels were built to a standard design but a few included in the class were built differently.
Some were completed as fishing vessels rather than for military service. Many went on to be used in various roles during World War II.

## Design

The Mersey-class trawlers were purpose-built to a standard Admiralty design intended for patrol, anti-submarine and minesweeping roles. HMT John Quilliam, delivered in June 1917, was the first of the standard completions.
Propulsion was a three cylinder triple expansion steam engine, powered from a single boiler, and delivering nominal 87 horsepower (600 indicated horsepower)
The smallest of the non-standard ships measured 36.8 metres (120 ft 9 in) in length with a 6.71 m (22 ft 0 in) beam.

### Armament

* 1x QF 12-pounder 12 cwt naval gun: John Edmund, John Highland, John Jacobs, John Johnson, John Pasco, John Quilliam, John Welstead, John Yule, Richard Bulkeley, Richard Colliver, Robert Double, Robert Drummond, Samuel Jameson, Thomas Jarvis, Thomas Johns, Thomas Whipple, William Doak, William Honnor, William Inwood, William Jackson, William Johnson, William Ram
* 1 × QF 12-pdr 12 cwt gun and mechanical minesweeping gear: Cornelius Buckley, William Abrahams, Andrew King, George Andrew, Henry Cramwell, Henry Ford, Isaac Chant, James Buchanan, Lewis Roatley, Michael Clements, Robert Barton, Robert Bookless, Thomas Atkinson, Thomas Bailey, Thomas Thresher, William Jones, William Rivers
* 2 × QF 12-pdr 12 cwt gun and mechanical minesweeping gear: William Westenburgh
* 1x QF 4-inch gun, 1 × QF 12-pounder 12 cwt, 1x depth-charge thrower (also known as "bomb thrower"): Fraser Eaves
* 1 × QF 12-pdr 12 cwt gun, 1x depth-charge thrower: George Bligh, James Adams, John Ebbs, John Felton, John Jefferson, Lewes Reeves, Nicholas Dean, Samuel Dowden, Thomas Cornwall
* 1x QF 6-pounder Hotchkiss: Richard Jewell
* 1 × QF 4-inch gun: Thomas Jago

## Ships of class

For the Mersey-class the HMT prefix meant "His Majesty’s Trawler" but HMT was also used for vessels taken into Sea Transport Service as transports ("Hired Military Transport", though often referred to as “His Majesty’s Troopship”) and His Majesty’s Tug,.
Standard Mersey :
| Name | Admiralty number | Launch date | Shipbuilder | Notes | Fate |
| HMT Alexander Hills | 3549 | 22 May 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1x QF 12-pounder 12 cwt naval gun Crew: 15, up to 18 with wireless. Renamed Moy September 1920. | Sold January 1946, renamed Coral Island 1947. |
| HMT Alexander Macbeth | 4241 | 14 July 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed John W. Johnson. |
| HMT Andrew Jewer | 3844 | 4 December 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun Crew: 15, up to 18 with wireless. Gunnery tender. Renamed Nith September 1920, Excellent June 1922. | Sold 1946, renamed Malvern. |
| HMT Andrew King | 3545 | 19 April 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Hydrophone vessel, then minesweeper. Renamed Ouse September 1920. | Mined 20 February 1941 off Tobruk. |
| HMT Benjamin Hawkins | 3858 | 7 February 1920 | Goole SB | Completed as fishing vessel. | Sold 17 October 1919. Delivered February 1920, named Frobisher. Purchased June 1933 as boom defence vessel, renamed Fastnet. |
| HMT Charles Adair | 3551 | 7 June 1917 | Cochrane | Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1923, renamed Sleaford 1924. Served as French Saint Benoit in WWII |
| HMT Charles Hammond | 3830 | 26 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. | Sunk 2 November 1918 in collision with destroyer HMS Marksman off Kirkcaldy. |
| HMT Christopher Dixon | 3563 | 4 September 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. | To Irish Government 1922, same name. Served as Lord Gainford in WWII. |
| HMT Daniel Fearall | 3571 | 2 November 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun, 1x Depth-charge thrower and mechanical minesweeping gear: Crew: 15, up to 18 with wireless. Training ship. Renamed Stour September 1920, Pembroke September 1922, Stour 1939. | Sold July 1946, renamed Storesse 1947. |
| HMT Daniel Mcpherson | 4242 | 16 August 1919 | Cochrane | Completed as fishing vessel | Sold 1919, renamed Lord Halifax. |
| HMT Daniel Munro | 4239 | 20 June 1919 | Cochrane | Completed as fishing vessel | Sold 1919, renamed Estrella do Norte and served as such in WWII. |
| HMT Degara Lerosa | 4237 | 6 June 1919 | Cochrane | Completed as fishing vessel | Sold 1919, renamed James Johnson. Served as Greek Axios in WWII. |
| HMT Edward Druce | 3736 | 30 July 1918 | Goole SB | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1920, renamed Girard and served as such in WWII. |
| HMT Edward Mcguire | 4251 | 17 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1920, renamed Cape St. Vincent. Served as Korowa (RAN) in WWII. |
| HMT Edward Williams | 3547 | 8 May 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-pdr 12 cwt gun, 1x Depth-charge thrower and mechanical minesweeping gear: Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1922, renamed Cape Trafalgar 1923 and served as such in WWII. |
| HMT Fraser Eaves | 3567 | 2 October 1917 | Cochrane | 138 × 23 × 13ft. Armament: × 4 in, 1 × 12-pdr AA, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. Renamed Doon September 1920. | Sold 1946, renamed Donesse. |
| HMT George Andrew | 3556 | 23 Jul 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1921, renamed Lord Astor. Served as Cranefly in WWII. |
| HMT George Bligh | 3542 | 24 February 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. | Sold 1921, same name. Became fisheries research vessel. Served in WWII. |
| HMT George Brown | 3548 | 10 May 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. Renamed William Dogherty December 1919. | Sold 1922, renamed Rosedale Wyke. |
| HMT George Fenwick | 3568 | 10 January 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. Renamed William Dogherty December 1919. | Sold 1923, renamed Cape Otway. Served as Greek Strymon in WWII |
| HMT George Westphall | 3575 | 7 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun. Crew: 15, up to 18 with wireless. | Sold 1921, renamed Estelle Yvonne. Lost 1923. |
| HMT Henry Cramwell | 3705 | 24 December 1918 | Lobnitz | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper | Sold 1922 to Spain, renamed Xauen. |
| HMT Henry Ford | 3569 | 18 October 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. Renamed Boadicea II February 1919, Henry Ford February 1920. | Sold 1921, renamed Duperre and served as such for France in WWII. |
| HMT Henry Lancaster | 4231 | 8 Apr 1919 | Cochrane | 138 × 23 × 13ft. Armament: usually 1 × 12-pdr & BT. Crew: 15, up to 18 with wireless. Marker buoy vessel | Sold August 1921, same name. Served as Longtow in WWII. |
| HMT Henry Marsh | 4253 | 31 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1920, renamed Springbok. |
| HMT Isaac Chant | 3704 | 1 October 1918 | Lobnitz | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. Renamed Colne September 1920. | Sold 1949. |
| HMT James Adams | 3555 | 7 July 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. | Sold 1920 renamed Pilote 5 and served as such for Belgium in WWII. |
| HMT James Buchanan | 3565 | 18 September 1917 | Cochrane | Armament: 1 × 12-pdr AA. Crew: 15, up to 18 with wireless. Hydrophone vessel, then minesweeper. | Sold 1922, renamed Stoneferry. Served as Force in WWII. |
| HMT James Caton | 3703 | 26 August 1918 | Lobnitz | Armament: 1 × 12-pdr AA. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1921, renamed Emilie Pierre. Served as French St. Pierre d'Alcantara in WWII |
| HMT James Hayes | 3859 | 27 June 1919 | Goole SB | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed Viscount Grey. Stranded 11 February 1920, total loss. |
| HMT James Hulbert | 3799 | 9 Sep 1919 | Lobnitz | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed M. J. Reid. Served as Jean Frederic in WWII. |
| HMT James Jones | 3842 | 9 Nov 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun:. Crew: 15, up to 18 with wireless. Renamed Cherwell September 1920. | Sold 1948 with same name. |
| HMT James Ludford | 4232 | 1 May 1919 | Cochrane | 138 × 23 × 13ft. Armament: usually 1 × 12-pdr & BT. Crew: 15, up to 18 with wireless. Served as marker buoy vessel | Mined 14 December 1939 off the Tyne. |
| HMT James Mansell | 4238 | 26 June 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Snorri Sturluson, James Mansell 1922. |
| HMT James Mcdonald | 4244 | 9 September 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Grand Fleet. Served as Barbara Robertson in WWII. |
| HMT James Mclaughlin | 4250 | 1 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed General Birdwood and served as such in WWII. |
| HMT James Wright | 3576 | 15 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun:. Crew: 15, up to 18 with wireless. | Sold 1921, renamed Lord Ancaster. Served as Loch Moidart in WWII. |
| HMT James Young | 4235 | 8 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, same name. |
| HMT Jeremiah Lewis | 4234 | 25 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: usually 1 × 12-pdr & BT. Crew: 15, up to 18 with wireless. | Sold 1920, renamed Field Marshal Robertson. |
| HMT John Cormack | 3562 | 4 September 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun:. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Lord Pirrie. Served as Chiltern in WWII. |
| HMT John Cottrell | 4463 | 1 November 1919 | Goole SB | Completed as fishing vessel. | Sold 1919, renamed St. Endellion. Served as Blighty in WWII. |
| HMT John Dunn | 3741 | 27 February 1918 | Ferguson | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun:. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1923, same name. Served as Florence Brierley in WWII. |
| HMT John Dutton | 3739 | 17 January 1918 | Ferguson | 138 × 23 × 13ft. Armament: 1 × QF 12-per 12 cwt gun:. Crew: 15, up to 18 with wireless. | Sold 1921, later renamed Karlsefni. |
| HMT John Ebbs | 3566 | 2 October 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr, 1 × 3.5 in BT. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1920, renamed Pilote 4. Served as Belgian ship A4 in WWII. |
| HMT John Edmund | 3738 | 22 October 1918 | Goole SB | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Renamed Foyle 9.1920. Loaned September 1921 to June 1934 to South African Navy as Sonneblom. | Sold 1946, renamed Cramond Island. |
| HMT John Felton | 3570 | 1 Nov 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA, 1-6in BT. Crew: 15, up to 18 with wireless. | Sold 1920, same name. |
| HMT John Highland | 3797 | 23 September 1918 | Ferguson | 138 × x 23 × 13 ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1920, renamed Ocean Ensign. |
| HMT John Jacobs | 3833 | 15 April 1918 | Cochrane | 138 × x 23 × 13 ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Castlenau and served as such in WWII. |
| HMT John Jefferson | 3834 | 23 April 1918 | Cochrane | Hydrophone vessel. | Sold 1920, renamed St. Amant. Served as Lady Enid in WWII. |
| HMT John Johnson | 3832 | 19 April 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Cloughton Wyke and served as such in WWII. |
| HMT John Mann | 4245 | 6 September 1919 | Cochrane | Completed as fishing vessel. | Sold 1920, renamed Earl Haig. Purchased 1933, renamed Barnet. Sold 1947. In 1950 enployed by salvors of HMS Warspite off Penzance. |
| HMT John Pasco | 3544 | 19 April 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Escort. | Sold 1922, renamed Arin Bjorn Hersir. |
| HMT John Quilliam | 3541 | 12 February 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1921. Converted to Danish research vessel Dana II |
| HMT John Welstead | 3573 | 15 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Lord Harewood. Served as Myrland in WWII. |
| HMT John Yule | 3543 | 24 March 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1921 renamed Notre Dame de Lorette. |
| HMT Jonathan Clarke | 4465 | 24 March 1920 | Goole SB | Completed as fishing vessel. | Sold 1920, renamed St. Keverne. |
| HMT Jonathan Collins | 4464 | 26 November 1919 | Goole SB | Completed as fishing vessel. | Sold 1919, renamed St. Minver and served as such in WWII. |
| HMT Langdon Mackennon | 4243 | 21 October 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Douglas H. Smith. Lost 1921. |
| HMT Lewis Mackenzie | 4240 | 26 June 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Florence Johnson. |
| HMT Lewis Reeves | 3553 | 23 June 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Lord Hawke. Lost 1922. |
| HMT Lewis Roatley | 3554 | 7 Jul 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. Minesweeper | Sold 1922 renamed STALWART. |
| HMT Michael Clements | 3561 | 21 Aug 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr AA, 1 × 7.5 in BT. Crew: 15, up to 18 with wireless. Minesweeper | Sunk 8.8-18 in collision off St. Catherines Point. |
| HMT Michael Mcdonald | 4252 | 17 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Kanuck. |
| HMT Nicholas Couteur | 4236 | 20 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Mary A. Johnson. Lost November 1920. |
| HMT Nicholas Dean | 3740 | 11 March 1918 | Ferguson | Hydrophone vessel. | Sold 1921, renamed Notre Dame de France. |
| HMT Patrick Mitchell | 4248 | 16 April 1919 | Cochrane | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed Kelvin. |
| HMT Peter Hoffman | 3798 | 8 July 1919 | Lobnitz | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed K. M. Hardy. Served as French Imbrin in WWII. |
| HMT Peter Magee | 4249 | 1 May 1919 | Cochrane | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed Lord Ernle. |
| HMT Richard Bulkeley | 3560 | 21 August 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Mined 12 July 1919 in the North Sea while on loan to US Navy. |
| HMT Richard Colliver | 3701 | 26 February 1918 | Lobnitz | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Laurette. |
| HMT Richard Jewell | 3836 | 6 August 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922 renamed, Lord Knaresborough. Served as Fairway in WWII. |
| HMT Robert Barton | 3559 | 28 August 1917 | Cochrane | Minesweeper. | Sold 1922 renamed HAY BURNWYKE. Served as HAYBURN WYKE in WWII. |
| HMT Robert Bookless | 3557 | 23 July 1917 | Cochrane | 138 × x 23 × 13 ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1921 renamed GRIZ NEZ. Served as German M.4005 in WWII. |
| HMT Robert Cahill | 4468 | 13 April 1921 | Goole SB | Completed as fishing vessel. | Sold 1921, renamed Pierre Andre and served as such in WWII. |
| HMT Robert Double | 3735 | 5 June 1918 | Goole SB | Hydrophone vessel. | Sold 1922, same name, renamed Wolborough 1925. |
| HMT Robert Drummond | 3742 | 4 May 1918 | Ferguson | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, same name, renamed Salmonby 1924. Lost 23 March 1926. |
| HMT Robert Finlay | 3857 | 23 May 1919 | Goole SB | Completed as fishing vessel. | Sold 1919, renamed Viscount Allenby. |
| HMT Robert Murray | 4256 | 30 June 1919 | Cochrane | Completed as fishing vessel. | Sold 1923, same name. Served as Northlyn in WWII. |
| HMT Samuel Dowden | 3564 | 18 September 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. 1 × 3.5 in BT. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1922, renamed Royal Regiment. Served as Sea Mist in WWII. |
| HMT Samuel Jameson | 3839 | 10 October 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Renamed Ettrick September 1920. | Sold 1926, renamed Loughrigg. Served as Phyllisia in WWII. |
| HMT Samuel Martin | 4255 | 28 June 1919 | Cochrane | Completed as fishing vessel. | Sold 1920, renamed Field Marshal Plumer. |
| HMT Simeon Moon | 4254 | 31 May 1919 | Cochrane | Completed as fishing vessel. | Sold 1920, renamed General Rawlinson. |
| HMT Thomas Atkinson | 3546 | 8 May 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1923, renamed Cavendish. Served as Erith in WWII. |
| HMT Thomas Bailey | 3558 | 4 August 1917 | Cochrane | Minesweeper. | Sold 1922, renamed Pamxon. |
| HMT Thomas Cornwall | 3702 | 10 June 1918 | Lobnitz | 138 × 23 × 13ft. Armament: 1 × 12-pdr, 1 × 3.5 in BT. Crew: 15, up to 18 with wireless. | Sunk 29 October 1918 in collision off Flamborough Head. |
| HMT Thomas Cruize | 3706 | 30 January 1919 | Lobnitz | Completed as fishing vessel. | Sold 1919, renamed Celerina. Lost 11 December 1922. |
| HMT Thomas Jago | 3835 | 31 July 1918 | Cochrane | 138 × 23 × 13ft. Armament: × 4 in. Crew: 15, up to 18 with wireless. Escort. | Sold 1922, renamed St. Valery. Served as Lady Eleanor in WWII. |
| HMT Thomas Jarvis | 3840 | 24 October 1918 | Cochrane | 138 × 23 × 13ft. Armament: × 4 in. Crew: 15, up to 18 with wireless. Special Service Vessel. Renamed Exe September 1920. | Sold 1928, renamed Jan Volders. |
| HMT Thomas Johns | 3837 | 3 September 1918 | Cochrane | 138 × 23 × 13ft. Armament: × 4 in. Crew: 15, up to 18 with wireless. Renamed Eden September 1920, to South African Navy 1921–1934, renamed Immortelle. | Sold 1945. |
| HMT Thomas Maloney | 4247 | 14 June 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed St. Neots. Served as Adam in WWII. |
| HMT Thomas Matthews | 4246 | 6 October 1919 | Cochrane | Completed as fishing vessel. | Sold 1919, renamed Earl Beatty. |
| HMT Thomas Thresher | 3572 | 9 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1922, same name. Served as Syrian in WWII. |
| HMT Thomas Whipple | 3574 | 4 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1922, renamed Lord Lascelles. |
| HMT William Chatwood | 4467 | 24 February 1921 | Goole SB | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1921, renamed Blanc Nez. |
| HMT William Courtney | 4466 | 2 February 1921 | Goole SB | Completed as fishing vessel. | Sold 1921, renamed Ternoise. |
| HMT William Doak | 3737 | 23 September 1918 | Goole SB | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Hydrophone vessel. | Sold 1922 to Spain, renamed Arcila. |
| HMT William Forbes | 3856 | 25 May 1919 | Goole SB | 138 × 23 × 13ft. Completed as fishing vessel. | Sold 1919, renamed Syrian. |
| HMT William Honnor | 3796 | 26 August 1918 | Ferguson | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Escort. | Sold 1922, renamed Grimurkamban. |
| HMT William Inwood | 3841 | 30 October 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Escort. Renamed Blackwater September 1920. | Sold 1946, renamed Spleis. |
| HMT William Jackson | 3831 | 29 February 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. | Sold 1921, renamed Lord Byng. Served as Evelyn Rose in WWII. |
| HMT William Johnson | 3843 | 22 November 1918 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Loaned to US Navy 1919. | Sold 1921, renamed Lord Birkenhead. |
| HMT William Jones | 3838 | 8 September 1918 | Cochrane | Minesweeper. Renamed Boyne September 1920. | Sold 1946, renamed Nypuberg. |
| HMT William Leech | 4233 | 12 February 1919 | Cochrane | 138 × 23 × 13ft. Armament: usually 1 × 12-pdr & BT. Crew: 15, up to 18 with wireless. Renamed Excellent February 1919. | Sold 1922, renamed William Leech. Served as French Excellent in WWII. |
| HMT William Ram | 3550 | 7 June 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Escort. | Sold 1921, renamed Lord Carson. Served as Welbeck in WWII. |
| HMT William Rivers | 3552 | 9 June 1917 | Cochrane | 138 × 23 × 13ft. Armament: 1 × 12-pdr. Crew: 15, up to 18 with wireless. Minesweeper. | Sold 1921, renamed Mont Cassel and served as such for France in WWII |
Non-standard vessels :
| Name | Admiralty number | Launch date | Shipbuilder | Notes | Fate |
| | | | | All: From 248-324 grt, Length from 117-125 ft Beam and draught 22 ft x 23 ft. Approx. TE 480ihp, 10.5 kts. Armament: 1x QF 12-pounder 12 cwt naval gun, 1x Depth-charge thrower and mechanical minesweeping gear: Crew: 15, up to 18 with wireless. | |
| HMT Anthony Aslett | 3579 | 22 February 1917 | Cochrane | Minesweeper. Renamed Rother September 1920. | Sold 1922 to Spain, renamed Uad Quert. |
| HMT Charles Astie | 3578 | 25 January 1917 | Cochrane | | Mined 26 June 1917 off Lough Swilly. |
| HMT Cornelius Buckley | 3581 | 24 February 1917 | Cochrane | Minesweeper. | Sold 1922, renamed Aria. |
| HMT John Appleby (ex-Corinthia) | 3612 | 30 January 1917 | Cook, Welton & Gemmell | Hydrophone vessel. | Sold 1923, renamed Lois and served as such in WWII. |
| HMT John Arthur (ex-Sannyrion) | 3613 | 10 February 1917 | Cook, Welton & Gemmell | Hydrophone vessel. | Sold 1922, renamed Gladys and served as such in WWII. |
| HMT William Abrahams | 3580 | 24 February 1917 | Cochrane | Minesweeper. | Sold 1922, renamed Santini. |
| HMT William Westenburgh | 3577 | 25 January 1917 | Cochrane | Minesweeper. | Sold 1921, renamed Lord Talbot. Served as Star of the Realm in WWII. |
A further 44 vessels were ordered, but were cancelled before delivery.