[4] Sixteen-year-old Marvin and his Rutherford Grammar School friend, Bruce Welch, met Johnny Foster, Cliff Richard's manager, at The 2i's Coffee Bar in Soho, London.

His first critically lauded, eponymous solo album of instrumentals, which featured guitar set to orchestrated backing, was released in 1969, following the first disbanding of the Shadows, in late 1968.

With Welch, Brian Bennett, and John Rostill, he wrote hits for Cliff Richard, including; "On the Beach", "I Could Easily Fall in Love with You", "Time Drags By", and "In the Country".

In 1977, Marvin played lead guitar on Roger Daltrey's third solo album, One of the Boys, on the tracks Parade and Leon.

[citation needed] He co-wrote Olivia Newton-John's 1977 hit "Sam" with John Farrar and Don Black.

[citation needed] Marvin dueted twice with French guitarist Jean-Pierre Danel – on his 2007 and 2010 albums, both top-ten hits and certified gold.

[8] In 2024, Marvin contributed guitar to a re-release of Mark Knopfler's "Going Home: Theme of the Local Hero" in aid of the Teenage Cancer Trust.

He has made impromptu appearances on stage when musician friends visit the area, such as in February 2013 when Cliff Richard held a concert at Sandalford Winery.

The website continued, "Hank is legendary for his expressive phrasing, but rather than use his Strat's controls to accentuate volume swells, he prefers to use a pedal to give that vocal quality to his lines.

"[13] Marvin influenced many British rock guitarists, including George Harrison,[14] Eric Clapton,[14] David Gilmour,[14] Brian May,[15] Mark Knopfler,[14] Peter Frampton,[16] Steve Howe,[17] Roy Wood,[18] Tony Iommi,[19] Pete Townshend,[20] Jeff Beck[21] and Jimmy Page.

[28] While Welch and Bennett were both appointed Officer of the Order of the British Empire (OBE) in the 2004 Birthday Honours for services to music, Marvin declined for "personal reasons".

[29] On 28 October 2009, Marvin was presented with a BASCA Gold Badge Award[30] in recognition of his unique contribution to music.