This week's new DVD and Blu-ray

Four Lions DVD & Blu-ray, Optimum Four Lions is a film you really need to see more than once. Not just because it's funny and unique – it's both of those things – but because it's almost impossible to approach without any preconceptions. Indeed, if you haven't seen it already, the words "Chris Morris" and "terrorist comedy" come so loaded with expectation, your poor brain could fry trying to figure out how incendiary such a film could be. The problem with that, though, is that you're not Chris Morris, so to try and second-guess this mercurial satirist will always be fruitless. So, what is it? Well, Four Lions is certainly provocative, but the real shock is how conservative it appears on the surface. Morris has often evoked Dad's Army when describing his feature debut, in which an idiotic northern terrorist cell plans its own jihad, and the comparisons are easy to see. But Monty Python's Life Of Brian is perhaps a better reference, since this, too, is a dissection of absurd human behaviour rather than an attack on ideology. It helps that it's brilliantly performed – particularly by Riz Ahmed, as lead lion Omar, and Nigel Lindsay as white muslim Barry – and fantastically quotable too, even getting emotional impact from the words "rubber dinghy rapids". But while it's certainly a brave film, it's more laudable for its subtlety of tone. That Morris researched his subject matter so carefully is what makes this film so unexpectedly reverent – and, most shocking of all, sweet. Cemetery Junction Ricky Gervais and Stephen Merchant's smalltown coming-of-age story. DVD & Blu-ray, Sony City Of Life And Death Chinese drama, based on the invasion of Nanking. DVD & Blu-ray, High Fliers Hot Tub Time Machine Back-to-the-80s comedy, starring John Cusack. DVD & Blu-ray, Fox When You're Strange Rock-documentary about the rise of the Doors, rich with period footage. DVD & Blu-ray, Universal Daughters Of Darkness Cult horror, based on the myth of Elizabeth Bathory. DVD, Optimum Sherlock BBC mini-series, updating Conan Doyle's Victorian sleuth. DVD & Blu-ray, 2 Entertain