Born in a tenement flat in Glasgow in 1942, orphaned by the age of 4, and a survivor of appalling abuse at the hands of his own family, Billy's life is a remarkable story of success against all the odds.
Billy found his escape first as an apprentice welder in the shipyards of the River Clyde. Later he became a folk musician - a 'rambling man' - with a genuine talent for playing the banjo. But it was his ability to spin stories, tell jokes and hold an audience in the palm of his hand that truly set him apart.
As a young comedian Billy broke all the rules. He was fearless and outspoken - willing to call out hypocrisy wherever he saw it. But his stand-up was full of warmth, humility and silliness too. His startling, hairy 'glam-rock' stage appearance - wearing leotards, scissor suits and banana boots - only added to his appeal.
It was an appearance on Michael Parkinson's chat show in 1975 - and one outrageous story in particular - that catapulted Billy from cult hero to national star. TV shows, documentaries, international fame and award-winning Hollywood movies followed. Billy's pitch-perfect stand-up comedy kept coming too - for over 50 years, in fact - until a double diagnosis of cancer and Parkinson's Disease brought his remarkable live performances to an end. Since then he has continued making TV shows, creating extraordinary drawings... and writing.