Step Up 4: Miami Heat (PG)

Fourth time around the faces may be different but otherwise this dance franchise budges hardly an inch from formula: good-looking leads from different sides of the tracks, the promise of a cash reward in a dance contest, the introduction of edgy street moves into straight routine.

The gimmick this time is a flash mob invading public spaces – traffic jam, museum opening, posh restaurant – and orchestrating dance moves only slightly less ambitious than the Olympics opening ceremony.

YouTube is now the streetdancers' launch platform. If the acting were as expressive as the dancing this lot would be world-beaters.