He says: I would love to have done Back In Black. My friend Mutt Lange did it and he's awesome, he's amazing. I love AC/DC. But then, I would love to work with Aerosmith as they were back in the day and Pink Floyd."

I was fortunate to be at a recording studio when I first started my work in the 70s, where we had the likes of Black Sabbath in one, Jethro Tull in another, Yes in another - it just became normal.

"The first week I was there making tea, saying 'here you are, Mr Rockstar' but they just became people like we all are - no one's any different from anybody else."