T his ludicrous, rabid thriller, shot largely on first-person GoPros, is like Peep Show on PCP. The cumulative effect is of being crammed into a monster-truck tyre and rolled down Mount Everest. It is relentlessly committed to packing the frame with gratuitously entertaining gimmickry, and needlessly annotates the action in pink graffiti – for example, totting up at one point how many people the hero has knocked unconscious with a dildo – so that it borderline qualifies as experimental cinema. Among the many advantages of its perspective is that it helps us buy that John Hannah, 64, is a parkour genius.

Hannah plays Karl Davis – or that is apparently his name, when this amnesiac wakes up to a Hangover-like bombsite of a hotel room. He’s got a banging headache, party detritus is littered everywhere, and there is a dead body in the bathtub. Or perhaps this scenario is Crank inverted; Davis has left a box of pills and a note to self to take one whenever his heart rate gets too elevated.…