There is a big problem in believing any of it, but a certain amount of fun watching television's more ghastly denizens wonder whether murder will improve the ratings. It does.

Triumphs, humiliation, barmy monologues and temper tantrums - reality television is scarcely in need of parodying. Certainly not from a preachy film like this.

Bill Guttentag's film is one of those shrill and cheery conspiracies on the wilder side of probability. But the black comedy has an infectious pace, and screwy logic.

A surprisingly plausible mockumentary...