The most radio ignorant contestant in British TV quiz show history?

In today's  edition of Tipping Point a contestant called Andy was asked the question which Radio 4 programme did Kristy Young took over from Sue Lawley as presenter. Andy said in his defence that his car radio was not set at Radio 4, had not heard of either women and therefore gave the answer as Blue Peter! The answer is of course Desert Island Discs which has been broadcast since the 1940's, when Andy told of the long running status of the programme he just had a blank face. The most amazing thing was that this in the head to head round and needless to say he lost with the winner going on to win the 10 thousand pound jackpot.