Question: The song covered by Del Davis and features on "Mellow Dubmarine" was originally recorded by which English duo ?

Context articles: Del Davis (singer)
I Lived
Alisha's Attic
Distant Shores (album)
Before and After (Chad &amp; Jeremy album)
Mellow Dubmarine
A World Without Love
Hello, I'm Johnny Cash
Live at Billy Bob's Texas (Stoney LaRue album)
Please Mr. Please

Del Davis is a reggae singer of the 1970s.
 His cover of "World Without Love" was featured on "Mellow Dubmarine".
"I Lived" is a song recorded by American pop rock band OneRepublic.
 It was released as the sixth single from the album, "Native" (2014).
 It was originally planned to be released as the fifth single in January 2014, but was shelved in favor of "Love Runs Out".
 It was the final song covered in the series finale of the hit FOX musical comedy-drama "Glee" in March 2015.
Alisha's Attic were an English duo group of the 1990s and early 2000s.
 The two members were sisters Shelly McErlaine (née Poole) and Karen Poole, born in Barking and Chadwell Heath respectively.
 Their father is Brian Poole of 1960s group Brian Poole and the Tremeloes.
 The "Alisha" referred to in the group's name is a fictional character created by Shelly and Karen, based on an imaginary childhood friend of Shelly's.
 "Attic" is a reference to the attic studio belonging to a composer friend, Terry Martin, where they originally recorded demos.
Distant Shores is the fifth studio album by the English duo Chad & Jeremy.
 It was released on 15 August 1966.
 "Distant Shores" was recorded between November 1965 and March 1966.
 This is the first album in which the duo were given time to craft their sound and style.
 This album is a precursor to their psychedelic album, "Of Cabbages and Kings".
 It includes the first recording of Paul Simon's "Homeward Bound", predating even Simon & Garfunkel's record.
Before and After is the third studio album and first Columbia record by English duo Chad & Jeremy.
 It was released on May 25, 1965.
 "Before and After" was recorded in 1965.
 This album includes many sunshine pop, baroque pop and folk rock styled songs by the duo, including their final top 20 hit, "Before and After".
Mellow Dubmarine is a double album featuring reggae covers of various Beatles songs.
 A handful of Wings, Paul McCartney, John Lennon and George Harrison solo tracks are also featured.
 The tracks compiled were apparently recorded between the late 1960s and 2000.
 Several songs are covered by more than one artist - for example, there are three versions of "Let It Be".
 The album is hard to find in stores.
"A World Without Love" is a song recorded by the English duo Peter and Gordon and released as their first single in February 1964.
 It was included on the duo's debut album in the UK, and in the US on an album of the same name.
 The song was written by Paul McCartney and attributed to Lennon–McCartney.
 The B-side was "If I Were You", written by Peter and Gordon.
Hello, I'm Johnny Cash is the 33rd album by American country singer Johnny Cash, released on Columbia Records in 1970 (see 1970 in music).
 "If I Were a Carpenter", a famous duet with Cash's wife, June Carter Cash, earned the couple a Grammy Award for Best Country Performance by a Duo or Group with Vocal in 1971 (see Grammy Awards of 1971); the song also reached No. 2 on the Country charts.
 This album also includes "To Beat the Devil", the first Kris Kristofferson song covered by Cash; the two would later collaborate numerous times, most famously on "Sunday Mornin' Comin' Down".
 "See Ruby Fall" and "Blistered" were also released as singles, and the album itself reached No. 1 on the country charts and No. 6 on the pop charts.
 It was certified Gold on 1/29/1970 by the R.I.A.A.
 The album has been released on CD (Sony Music, Original Album Classics, along with "The Johnny Cash Show" and "Man In Black") and it has been made available on official download sites.
 This album is not to be confused with a best-of cd that has the same name.
Live at Billy Bob's Texas is Stoney LaRue's first live album.
 They are one of many bands to record a "Live at Billy Bob's Texas" album at the Fort Worth honky-tonk.
 It was originally released in September 2005 as a limited edition CD/DVD combo.
 It was re-released in 2006 with the full track listing.
 The album included one new song, "Love You For Loving Me," as well as six cover songs.
 The song, "Feet Don't Touch The Ground," was originally recorded by Brandon Jenkins on his 2003 album, "Unmended".
 The song "Oklahoma Breakdown" was originally recorded by the Norman-based group, Hosty Duo.
 "Goin' Down the Road (Feelin' Bad) is a folk song originally sung by Woody Guthrie.
 The song The Weight was written by Robbie Robertson and recorded by The Band on their 1968 album, "Music from Big Pink".
 "Long Black Veil" is a 1959 song, written by Danny Dill and Marijohn Wilkin and originally recorded by Lefty Frizzell as well as many other artists.
 The album's cover photograph was by Texas photographer Todd Purifoy.
"Please Mr. Please" is a song from 1975 by the British-Australian singer Olivia Newton-John.
 The song was written by Bruce Welch and John Rostill, both members of British pop singer Cliff Richard's backing band, The Shadows.
 Welch had originally recorded the song himself in 1974 with no commercial success.
 The song appears on Newton-John's album, "Have You Never Been Mellow".