It's the roaring twenties and, having spotted a rival scouting for girls on her patch, Belgravia brothel madame Mrs. Hill challenges the esteemed Lady Evelyn Chatterley to a wager.

Having argued over who runs the classier, more successful establishment, the pair bet £1,000 that their respective star girl can seduce an "impossible" subject: Lady Evelyn's star - her niece, Constance - must be photographed with a Catholic bishop; whilst the best of Mrs. Hill's girls - her daughter, Fanny - is tasked with being pictured alongside a raging homosexual transvestite.

However, when both girls manage to bed their prey at the same time, further evidence to settle the wager is called for. The two scheming madames select a name at random from the telephone directory, and whoever beds him - or her - first will win outright.

The lucky stranger? Mild-mannered, middle-aged, upmarket wine merchant, Mr. Lothran. The girls may have to raise their game...