One of pop music’s most enduring figures talks about his life, through the heady early days of Punk and 2-Tone, to the Eighties, where Madness became the biggest selling singles band of the decade. Along the way he tells us what it’s like to grow up in sixties Soho, go globetrotting with your best mates, make a dead pigeon fly and cause an earthquake in Finsbury Park. He talks to Martin Chilton.