Forever Eden, a Truman Show-style reality soap, launches on US network Fox tonight. With a budget of close to $20m (£11m), its makers claim it will be the world's biggest reality show - involving 11 members of the public relocating to a customised 48-acre Caribbean resort. Unlike in Big Brother, weekly evictions are decided by the cast rather than by public vote, with departees regularly replaced by viewers. As intriguing as the concept, though, is the fact that Forever Eden was conceived and made for the US by Brits - proof that reality rather than drama or comedy is fast becoming UK TV's greatest export.