Showstopper! and Mark Gatiss win Olivier Awards

Showstopper! The Improvised Musical has won the Best Entertainment and Family Show at the Olivier Awards tonight. Mark Gatiss won Best Actor in a Supporting Role.

Radio 4's Showstopper is a new programme in which a musical is improvised on the spot, from audience suggestions. A straightforward transfer of Showstopper's Edinburgh show, it's all lickety-split smart and, supposedly, hilarious. This week we got The Godsister, a mafia musical set in a Chicago malt shop. Lots of scare-the-baby singing, but my sides remained unsplit.

One always needs a dose of originality after a large helping of nostalgia and that was certainly provided by Showstopper, a new comedy show during which a cast improvises a musical using suggestions from the studio audience. Curtain up on the first offering, and Dylan Emery was asking the ensemble for an opening number for a musical called The God Sister set in mafia gangland. Not surprisingly, the plot was nonsensical at times, or as Emery put it, "contextually unlikely", but on the whole the performers - including Pippa Evans, Ruth Bratt, Lucy Trodd, Sean McCann and Oliver Senton - produced one of the most entertaining half hour's radio I've heard in a long time.

Radio review: Showstoppers

This 'improvised musical' had plenty of energy, but the music was a mess, the plot was non-existent and the comedy was weak.