Justice is a toughie. It so often gets mangled in a slew of circumstance. The man who threw up beside me this week in Edinburgh at a production of A Theory of Justice: the Musical! as it revved towards climax may have not have been passing caustic comment on the show and its hymn to justice. But for me and others nearby it certainly gave the last ten minutes or so of the ‘all singing, all dancing romp through 2500 years of political philosophy’ an extra piquancy.