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(16/17)
Would you know who's depicted on the twenty-pound banknote, what number corresponds to neutral on the pH scale, or who's been on the cover of the Radio Times more often than anyone else? The competitors in Brain of Britain will have to dredge these facts from the recesses of their minds if they're to progress to the Final, in today's contest between returning winners from the heats stage.

Today's semi-finalists are:
Matt Barr from Bolton
Sue Brooks from Kent
Brian Leddy from Glasgow
George Scratcherd from Essex

A listener also stands a chance of winning a prize, if questions they have devised succeed in defeating the combined brain-power of the contestants.

Assistant Producer: Stephen Garner
Producer: Paul Bajoria