Soho theatre, London Impersonating chart-topping singing duo Michael Ball and Alfie Boe, the comics trade trills and gags as showbiz egos clash and simmering tension comes to the boil "The most successful double act no one you know has ever seen," is how Michael Ball and Alfie Boe are described in this identity-theft wheeze from comics Adam Riches and John Kearns. The gulf that yawns between fringe comedy and housewi…
