The son of a Glaswegian father, Davidson was born in Kidbrooke, London, and attended Kidbrooke Park Primary School, Blackheath, and St Austen’s School in Charlton. Having impressed some acquaintances of his father with impressions of celebrities, he was chosen to appear in Ralph Reader’s Gang Show at the Golders Green Hippodrome aged 12 and appeared on television in the Billy Cotton Band Show. He also briefly attended a stage school in Woolwich. Upon leaving school he was a drummer for pub bands and worked as a supermarket shelf stacker, a messenger, air ticket clerk for a travel agency, a cashier for Wall’s ice cream, for Rank Xerox (having trained as a reprographics operator) and as a window cleaner. Davidson found his way into show business when as a regular in a pub in Woolwich, he undertook an act after the regular comedian hadn’t turned up. He then became a regular on the London comedy circuit, and first auditioned for Opportunity Knocks in 1975, unsuccessfully; he was told by Hughie Green to “go away”. His audition for New Faces was more successful, and he proceeded to win the show by one point, and then to come second in the overall contest.
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