“I asked John if he’d like me to get them fixed for him. He told me not to worry they were just for the look! He said he’d send out for some that fit.

“I never did get them mended I just kept them as they were as John had left them.”

In the letter, Herring explained that he initially began working for the Beatles’ in 1967 when George Harrison   employed him as a landscape contractor at his home in Surrey.

John Lennon’s sunglasses sold at auction for £137,500 (Sotheby’s)

He was later promoted to the role of Harrison’s chauffeur, handyman and personal assistant until the Beatle left on an extended trip to India.

Starr then approached Alan about working for him instead.

Throughout his time working for the Beatles, Herring was given a rare behind-the-scenes glimpse at some of the band’s most memorable moments.

“Whilst employed for George and Ringo I attended most of the Beatles’ recording sessions at Abbey Road Studios  for the “White Album”, “Abbey Road” and “Let It Be” — it was a very exciting time to be around,” he wrote.

The sale also included other Beatles’ memorabilia, including a necklace with cowbells worn by Harrison, which sold for £10,000.