Problem: The secret recipe for which famous sauce, marketed by Lea and Perrins, has recently come to light, after the disclosure that it was found in a skip near the factory?
Answer: worcestershire sauce

Problem: How many steeplechase fences are on the Aintree Grand National race course?
Answer: 16

Problem: In the painting 'Mr and Mrs Clark and Percy' by David Hockney, who or what is Percy?
Answer: cat

Problem: Edith Cavell, who was executed in 1915 by German firing squad after aiding the escape of allied prisoners from Belgium, was a member of which profession?
Answer:
nurse