Episode 637
From Countdown
Episode 637 was broadcast on 19 August 1987, as part of Series 13.
Mark Preston played John Brooks, with Mark Preston winning 80 - 0. The Dictionary Corner guest was Gyles Brandreth, and the lexicographer was Freda Thornton.
This game is notable as being the first of only two times that a contestant has failed to score any points, and also for having the largest winning margin of all games played under the 9 round format.