If anyone was the Fifth Beatle, it was Brian [Epstein].

I did cocaine for about a year around the time of Sgt Pepper. Coke and maybe some grass to balance it out. I was never completely crazy with cocaine. I'd been introduced to it and at first it seemed OK, like anything that's new and stimulating. When you start working your way through it, you start thinking: 'Mmm, this is not so cool an idea,' especially when you start getting those terrible comedowns.

There are only four people who knew what the Beatles were about anyway.

Lyricists play with words.

George Martin, he's very good at a very sort of lush, sweet arrangement.

To keep the record straight, it wasn't always John and Yoko. We've all accused one another of various business things; we tend to be pretty paranoid by now, as you can imagine. There's a lot of money involved.

I was still 15 when I met John Lennon at a village fete in Woolton, in Liverpool.