The pair got together in Band Of Joy in 1967, before forming Led Zep with Jimmy Page and John Paul Jones. But Plant says it might never have happened.

He tells Sound Opinions: "I was playing once at a ballroom once and he came up and said, 'You're alright, but you'd be a lot better if I was your drummer.' I said, 'So you already understand that I'm in charge?'

"I said, 'Where do you live?' He said, 'Well, I live in Redditch.' I said, 'That's 20 miles from where I live - that's too far. You're not good enough.'