"How did you say you remember the number of your favourite Hackney carriage?" Sherlock Holmes asked his companion.

"I just remind myself," said Watson, "that I'm twice the man you are, and I recall the laws."

Holmes scribbled on a piece of paper: HOLMES+HOLMES = WATSON. "So if each letter represents a different digit, from 0 to 9, and no word or name may begin with zero, we seek the value of LAWS" he mused.

Can you help him?

A prize of the Chambers 21st Dictionary will be awarded to the sender of the first correct answer we open on 24 July. Answers to: Perplexity, The Independent, 1 Canada Square, Canary Wharf, London E14 5DL.

28 June answers:

Laurel & Hardy (herd aurally)

Batman & Robin (rabbit Manon)

Samson & Delilah (nasal demolish)

Winner: Jane Brown (Plymstock)