MARY LAW leading lady in THE MOUSE TRAP carries the new sign "6" and shares a toast with her poodle QUIBA outside the Ambassador's Theatre in London. The number six marks the sixth year of The Mouse Trap - an all-time record. Drinks were with the compliments of a restaurant opposite The Ivy who also placed a sign outside announcing that the restaurant was in its 41st year as a little piece of pleasant rivalry - 7th November 1958. 固opFoto