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Clips from a 1992 episode of the BBC2 teen show 100% in which a young Victoria Coren does stand-up comedy.  In the routine, Victoria mentions she was 19 a few weeks prior so my best guess is that this performance occurred just after her 20th birthday.

My Victoria Coren Mitchell Playlist:
VICTORIA COREN MITCHELL

My "Victoria" tribute video:
A Tribute to Victoria Coren-Mitchell