Pharmaceutical maintenance man Martin Hurdle livens up his tedious workdays by doing celebrity impressions. He learns that he has an 18-year-old son named Steven and, pausing only to impersonate Ronnie Corbett stuck in a pillar box, joins the lad for lunch. The meeting is a success but when Martin's attempt at getting a promotion to impress Steven backfires, he uses his mimicry skills to get revenge.