Anti-comedian Edward Aczel's latest show, The Random Flapping Of A Butterfly's Wings, was pitched as a work in progress - but Aczel's well-established style disguised any uncertainty in the new material.

Wielding a well-used flip-chart and accompanying marker pen, Aczel focused on economic and legislative trivia, graphs charting the progress of the show, and lists on apparently arbitrary topics.

This was all presented with a shambling, uncertain studied carelessness, and a lack of coherence and enthusiasm.

None of which should contain any comic potential - the very point of Aczel's show.

It's difficult to explain quite how it works, but work it certainly did - the string of non-sequiturs and nonsense presented, quite impassively, as a logical continuation was at one point enough to force one lady in the front row into uncontrollable hysterics for well over a minute.

Pauses, repetition and overlong routines - including one inspired role-play involving a bag of hats and a lot of patience from Aczel and audience alike - were other touchstones of the performance, bringing to mind the rhythm of a more affable Stewart Lee.

Aczel is not a performer for the mainstream, but has carved out his own impressively individual and inexplicably entertaining niche.