When the going got tough, Gordon Brown would pull his favourite Macavity trick and disappear. It seems his prodigy Ed Balls has learnt exactly the same trick. There has been a lot of grumbling over the weekend in Labour circles that the Shadow Chancellor all but disappeared in the wake of the local election results and was silent on the airwaves, leaving the mop up to the likes of Chuka and Tom Watson. He managed to Tweet his congratulations to the new MP for South Shields, but apart from that has stuck to local issues in his seat and talking about Shepherd’s Pie. His absence has been noted by more loyal colleagues…