With his distracted, Tommy Cooper-like cackle and air of embarrassed amateurism, John Etheridge likes to give the impression he has no idea what he's doing. But there's never a moment's doubt about his awesome authority whenever he touches a guitar.

The London-born guitarist gave himself the taxing task of a solo show aided by nothing more than a choice of instruments and a little technology to launch his new album, I Didn't Know.

Etheridge has an immense breadth of musical interests. This has allowed him to work with the pioneering British crossover band Soft Machine, with the violin virtuoso Stephane Grappelli, as the core of the highly creative Frank Zappa tribute band, Zappatistas, and sometimes with the classical guitarist John Williams.

Etheridge, in jazz guitar mode, opened with Charlie Parker and then a subtle account of Charles Mingus's Goodbye Pork Pie Hat. Then he relaxed into the Cameroonian groover Guitar Makossa (duetting with his own sampled rhythm part) and a sensuous Madagascan dance tune that sounded at times like a 1950s rock ballad.

He then explored a tone-poem of long echoing sounds and spacey effects, eased into a melody that wandered between Sometimes I Feel Like a Motherless Child and Summertime, before becoming Swing Low Sweet Chariot - the latter a gem of choir-like sound effects, busy low counterpoint and rich chords.

A stomping bassline under Lullaby of Birdland drove a sharp, high-register improvisation, and a churning, Hendrix-like account of Happy Birthday for an audience member rocketed off into a whirlwind of abstract sound, then a brief boogie, a clamour of bell-like sounds, and an abrupt dead halt. A master-of-all-genres guitarist at work, even if he does his best to hide it.