3 JULY 2004, Page 63

Q. I have been married for over 35 years and

have four children and two grandchildren and parents still alive. My husband, of whom I am still fond, has been engaged in a long, weekday affair with a friend of mine, which is probably delightful for him, but hurtful and boring for me. I am quite used to allowing him a long rein. I live in the country and he is in London during the week, and the thought of a fullscale confrontation and the inevitable ensuing drama seems pointless and damaging for all who would become involved. However, I am finding it increasingly galling to let them, particularly her, get away scot-free. How can I punish them suitably? She is a divorcee and a headmistress of a smart London prep school. Mary, please help me.

Name and address withheld A. Why not pop along to the school under cover of darkness one night (or send a proxy) an4 using a can of spray paint, deface the school entry-point in a childish hand with graffiti hinting that Miss has a boyfriend (perhaps her initials and his inside a love heart)? This small gesture should be enough to unnerve the couple and take the wind out of their sails.