London is putting on one of its classier acts with the BFI Film Festival – 240 films, 16 cinemas, 12 days, 1 festival will bring to you the newest most original films of the industry. 'Chemsex' is the slang term for sexualised drug use (specifically crystal meth, GHB and mephedrone) by men who have sex with men. The trend traces its birth in the growing use of online apps as a means of sexual hook ups and is seen as a significant contributing factor in the rise of HIV diagnoses in London. This documentary is a insightful investigation into what threatens to be a very important social issue. Over 18s only. Running time: 1 hour 20 minutes.