Alien Autopsy (12A)

Ant and Dec may be the princelings of prime-time TV but they're barely peasant-level in the big-screen stakes. They play a pair of chancers who come by some top-secret footage of the 1947 alien autopsy at Roswell, New Mexico. When the film proves unreliable, they decide to fake their own version. The story is told to an American director (Bill Pullman) via flashbacks, a complication that adds little in the way of texture and nothing in the way of laughs, the sole source of which is the collision of cackhanded DIY autopsy and the intrusive refreshments - Jammie Dodgers, sausages on sticks - provided by Dec's nan. Another British comedy for the slab.