W as ever a musical so eager to be liked, so anxious not to exclude? It is not just the patronising pre-show introduction, which assumes we have never been in a theatre and insists we all hate bankers. It is also the pathological number of pop-culture references in Rob Madge’s book. “We’re on your side,” it seems to say, “because we too have heard of Coronation Street, EastEnders, Cher, The Legend of Zelda , Jeremy Beadle, Mamma Mia!, Dirty Dancing, Wonderwall …” The list goes on. The level of insecurity is strange because Bank of Dave: The Musical is a tremendously likable show. The source material is the feelgood true-life story of Dave Fishwick (Sam Lupton), the Burnley businessman whose egalitarian conscience led him to step in where others had failed. Seeing his fellow townsfolk being held back for want of money, he determined to set up a non-profit bank that would treat them with trust and respect.…