How strange, how wickedly pleasurable it is to welcome the first play on the London stage about bestiality. In Edward Albee's latest reminder of the fragilities and temptations of married life, Jonathan Pryce's fraught 50-year-old husband, Martin, falls passionately in love with a goat called Sylvia. And what is more that love is consummated - off-stage and often - until Martin's understandably upset wife, Kate Fahy's Stevie, intervenes.