One Night Only review – sex is legal for 12 hours a year in bizarre romcom

‘What if The Purge was for premarital sex?’ is the odd, gimmicky elevator pitch for this slickly made yet ungainly oddity that can’t quite get past the grimness of its conceit Going into a romcom, there are always the same questions. Will there be genuine chemistry? Will the rom and the com be equal in parts? And, for the last decade and change, will this be the one that finally resurrects a genre…