An Edinburgh Festival favourite – Showstopper! has grown from its humble Islington origins to take on a west end theatre run. It is an improvised musical featuring some of the finest improv-ers on the London circuit, with each night's plot spinning out from audience suggestions. Even if musical theatre (or improvisation) isn't your cuppa, it's an irresistible show. Photo: Gaby Motola

Two shows today – a family-friendly one at 3pm and a regular show at 7pm.