When it comes to comedy, Edinburgh Fringe is a good arbiter of taste. Shirley and Shirley went down a storm during their recent festival run, which bodes well for London. Two sassy girls find themselves caught up in an after-hours lock-in. Cue a barrage of games, songs and raunchy characters as the night degenerates into a raucous after party. Prepare to drink hard and laugh harder as Shirley and Shirley lower the tone. Over 16s only.