British men are spending more on their underwear - or at least buying more underwear more often. Figures issued by M&S, which claims to be the UK's number one retailer of men's underwear, suggest a steady increase in the value of the market. The sector is now worth more than $260 million a year as against £230 million five years ago. And it is reputed to be going to be growing at the rate of two per cent year-on-year.