Revenge is a dish best served cold, they say, but some like it hot - body hot In ROBIN ANDERSON'S latest foray into sex crime, we cruise downriver from Chelsea Harbour to Canary Wharf and Wapping, where gay gallery owner Raymond Bartholomew stages a spectacular "Revenge" themed art show set up via the Internet. Its sell-out success blesses Raymond and his camp coterie with new horizons, new lovers and new sources of wealth. But before you can say "blackmail," the exhibitors' subjects start falling dead like flies - but in the most bizarre circumstances. Who's the latter-day "canvas Ripper? Could it be the colonic-inspired Anonymous Bosch or the heinous hand behind a group hara-kiri? Maybe even the "stitched-up" Man Ray or the evil inspiration behind Velasquez-inspired death camp? Once again ROBIN ANDERSON'S heady cocktail of gourmandising and extreme sex is calculated to titillate, amuse and enthral. But be aware, dear readers, that some passages have loads to be desired, while others are positively inflammatory Forewarned is forearmed