18 JANUARY 1992, Page 24

Sir: Now 60, I have long used 'Sir' for strangers

over 30, who usually return it. The tiny courtesy works delightfully, often leading to the stranger, if asked for an address, to take you to it personally. The result is as pleasing on trains and buses.

I like the French custom of calling all males 'Sir' regardless of age. However, the apparent age at which not to call a strange lady Mademoiselle is always thought-pro- voking.

Would not trouble in certain pubs be avoided if men called each other 'Sir'?

John Woodforde

New Hall, High Street, Lydd, Kent