Theatre Royal BathThis bizarre drama, with the star playing twins amid plenty of tap dancing, is a warp of hallucinations and reality Small Hotel is a play that defies category, or even explanation. This might be a work of outlandish genius, or a devised end of year A-level project featuring world-class actors (led by Ralph Fiennes and Francesca Annis). It is very funny, although perhaps it doesn't always mean to be,…