Satirist extraordinaire Chris Morris (TV's The Day Today and Brass Eye) makes his directorial debut with this audacious jihad comedy, pointing out that "terrorism is about ideology, but it's also about berks". The berks in question here are a group of hapless young Muslim men from the north of England, led by Omar (Riz Ahmed). They decide to become suicide bombers and then chaotically attempt to plan and commit a terrorist atrocity at the London Marathon. Some may feel that the subject matter should be off-limits to comedians, but there's nothing new about cinema mocking a dangerous enemy - just look at Charlie Chaplin's classic The Great Dictator. Morris's movie is very funny, occasionally emulating the faux quaintness of Ealing comedies, which were often much more barbed than they first appeared.Perhaps the most disturbing element of Four Lions is that, despite wanting to create murder on a vast scale - a grim fact the film doesn't dodge - the suicide bombers are a mostly likeable bunch.

Four Lions tells the story of a group of British jihadists who push their abstract dreams of glory to the breaking point. As the wheels fly off, and their competing ideologies clash, what emerges is an emotionally engaging (and entirely plausible) farce.