Question: What HP postcode covers the district that can be traced back to 1523 as a local field name that means `` a chalky valley '' ?

text: HP postcode area
Coverage
The approximate coverage of the postcode districts :
The HP postcode area, also known as the Hemel Hempstead postcode area, is a group of twenty-four postcode districts in England, within eleven post towns. These cover north-west Hertfordshire and much of Buckinghamshire. Mail for this area is sorted at the Home Counties North Mail Centre in Hemel Hempstead. The area served includes most of the borough of Dacorum in Hertfordshire and most of the Chiltern, Wycombe and Aylesbury Vale districts of Buckinghamshire, plus a small part of the South Bucks district.
Postcode district Post town Coverage Local authority area
HP1 HEMEL HEMPSTEAD Bourne End , Boxmoor , Chaulden , Fields End , Gadebridge , Great Gaddesden , Nettleden , Piccotts End , Water End , Warner 's End Dacorum
HP2 HEMEL HEMPSTEAD Gaddesden Row , Piccotts End , Grovehill , Adeyfield , Hemel Hempstead Industrial Estate Dacorum
HP3 HEMEL HEMPSTEAD Apsley , Bovingdon , Felden , Flaunden , Hemel Hempstead , Leverstock Green Dacorum
HP4 BERKHAMSTED Berkhamsted , Dagnall , Dudswell , Little Gaddesden , Northchurch , Potten End , Ringshall Dacorum , Aylesbury Vale
HP5 CHESHAM Chesham , Ashley Green , Bellingdon , Botley , Chartridge , Hawridge , Latimer , Lye Green , Newtown , Waterside , Whelpley Hill Chiltern
HP6 AMERSHAM Amersham ( north ) , Chesham Bois , Hyde Heath , Little Chalfont ( north ) Chiltern
HP7 AMERSHAM Amersham ( south ) , Coleshill , Little Chalfont ( west and centre ) , Little Missenden , Penn Street , Winchmore Hill Chiltern
HP8 CHALFONT ST. GILES Chalfont St Giles , Little Chalfont ( south ) Chiltern
HP9 BEACONSFIELD Beaconsfield , Forty Green , Holtspur , Jordans , Knotty Green , Seer Green South Bucks , Chiltern
HP10 HIGH WYCOMBE High Wycombe , Flackwell Heath , Handy Cross , Hedsor , Loudwater , Penn , Tylers Green , Wooburn , Wooburn Green , Wooburn Moor Wycombe , Chiltern
HP11 HIGH WYCOMBE Wycombe Marsh Wycombe
HP12 HIGH WYCOMBE High Wycombe , Booker , Sands Wycombe
HP13 HIGH WYCOMBE High Wycombe , Downley , Totteridge Wycombe
HP14 HIGH WYCOMBE Beacon 's Bottom , Bledlow Ridge , Bolter End , Bradenham , Cadmore End , Hughenden Valley , Ibstone , Lane End , Naphill , Northend , Stokenchurch , The City , Upper North Dean , West Wycombe Wycombe
HP15 HIGH WYCOMBE Cryers Hill , Great Kingshill , Hazlemere , Holmer Green , Hughenden Valley Wycombe , Chiltern
HP16 GREAT MISSENDEN Great Missenden , Ballinger , The Lee , Little Hampden , Little Kingshill , Prestwood , South Heath Chiltern , Wycombe
HP17 AYLESBURY Aston Sandford , Bishopstone , Butler 's Cross , Dinton , Dorton , Ellesborough , Ford , Great and Little Kimble , Kingsey , Haddenham , Meadle , Nash Lee , Stone , Upton , Westlington Aylesbury Vale , Wycombe
HP18 AYLESBURY Ashendon , Berryfields , Boarstall , Brill , Chearsley , Chilton , Cuddington , Dorton , Easington , Edgcott , Grendon Underwood , Ickford , Kingswood , Long Crendon , Lower Winchendon , Ludgershall , Oakley , Shabbington , Upper Winchendon , Waddesdon , Westcott , Worminghall , Wotton Underwood Aylesbury Vale
HP19 AYLESBURY Aylesbury , Berryfields , Buckingham Park , Fairford Leys , Prebendal Farm , Quarrendon , Watermead Aylesbury Vale
HP20 AYLESBURY Aylesbury , Aylesbury Town Centre , Broughton , Elmhurst Aylesbury Vale