I can't for the life of me find what it was called, largely as Channel 5 have made so many prostitution programmes since.
What was interesting was that it was centered on East London, so the targets were all the usual suspects - the one next to Draper's Field in Leyton (when a sour Chinese maid known only to the WGs as 'Aunty' ran it), Peaches (which the police were stunned to find such old English WGs working at, the owners actually shut up shop for good after the collar felt) and a host of humdrum Rom/Brazilian joints in Ilford/Barking (at which one security pretended he was there as a client and had paid the WGs for eight hours to chill with them!)