Best of all is the central performance from a very thin and wiry David Thewlis, looking like he stepped out of Mike Leigh's 'Naked' and into his army uniform. He's unsettling and alienated, hard to like because his story doesn't make sense, it's too complicated to accept compared to the 'easier' version that he had been killed. He drifts through the film like a ghost, resurrected but quite possibly better off dead.
His friends can't understand what happened to him, nor how he has been traumatised. His regiment can't accept him back, his presence seems to undermine morale. And so the homecoming hero is abandoned.
(it's not a comedy)