If you like pornography then look no further than a central London phone box. The cards are everywhere, stuck to the windows, the phone sets, the information boards of phone boxes across London, Brighton and Manchester offering everything from 'correction and discipline' to 'Lusty Latin Lovely, New in Town'. A visitor can hardly fail to notice and perhaps be shocked by them - one call box cleared by British Telecom recently had 800 plastered cards across it offering prostitutes' services. That doesn't actually leave much room for the phone equipment itself. They began innocuously enough a few years ago with words like 'French Mistress' together with a silhouette drawing and phone number. But this sub-industry of prostitution has grown so much that some boxes now contain hundreds of cards and the simple offer of services has been replaced by ever more graphic pictures or even pornographic photographs of the lady. Some are high-quality colour reproductions, expensive to produce and indicative of the money the women are making. Go into a phone box with a child and it is difficult to hide the messages on the walls. The cards have even become valuable currency in school playgrounds where children swap them among themselves. The phone boxes look hideous but British Telecom has been reluctant to take decisive action until now, apart from having teams going round removing up to 150,000 cards every week. Some 'card stickers' have been prosecuted for criminal damage but this has had little effect. The card business, hardly surprisingly, has attracted a nasty side. Men who are little more than hired thugs stick the things up, earning up to GBP200 (HK$2,396) for themselves tax free each day. That sort of work inevitably ends up with mini-gang wars about who has what pitch, which tout effectively operates which telephone box and so on. Now, at last, after doodling with prosecutions for littering and criminal damage, the telephone company has decided it will cut off all incoming phone calls to the numbers unless the woman involved stops using such cards. The obvious fear is that a lack of phone facilities might drive the girls on to the streets. But maybe not for long, for prostitution seems to find lots of supporters in Britain today, and not just among the punt-ers. Two chief constables in the North of England, one a woman, have been calling for prostitution to be legalised recently as a way of ridding the streets of the girls and the kerb-crawling men in cars who come to pay. In some cities there is such a backlash against the kerb-crawlers that there have been serious incidents on the streets and a couple of years ago in Bradford there were even riots against kerb-crawlers using Muslim areas. There has been a backlash from the moral majority who say legalising the oldest profession would solve nothing and amounts to giving in to crime. But a much more revered profession is now coming to the women's aid. A syndicate at Lloyds of London has agreed to underwrite what one broker called 'professional ladies'. 'Professional Cover' will be open to girls working on their own or in partnership who suffer redundancy, sickness or accident. The policy will even pay up to 90 per cent of declared earnings over the 12 months prior to the claim. Aids and sexually transmitted diseases are covered under a special policy. Clients will not be covered. In Britain much insurance is sold by door to door salesmen, ringing up making appointments. It begs questions about how the salesmen will find their target markets. And what will they take as commission?