Two new shows calculated to catch the seasonal outings and holiday audiences deal with two of the biggest-ever British political scandals – the MPs’ expenses row of 2009 and the Profumo case of 1963 – and respectively employ the two most populist forms of theatre: farce and the musical. In a further coincidence, both have been helped by conveniently timed news stories: a recommendation that Members of Parliament should receive an inflation-busting 11 per cent pay rise and new allegations of possible MI5 involvement in the death of a key player in the 1960s case.As most theatregoers will realise immediately from its title, The Duck House deals with the events, a year before the 2010 election, that led to many long-serving MPs being forced to retire from their seats. The m