It’s 1978 and in a Boston warehouse, an IRA arms trade goes wrong, leading to a bloody, chaotic battle between two gangs. However, this is also a Mr Ben Wheatley production, so the physical violence going down on screen is outclassed by the psychological games he plays. Mr Wheatley’s last film, High-Rise with Mr Tom Hiddleston, was lauded as a masterpiece by some and derided as celluloid masturbation by others. Free Fire is a wholly more digestible enterprise and much the better for it.