It's ironic that Prime Minister David Cameron's first reshuffle became almost more telling for the one minister that blocked a move from his post than for the several other ministers that got the boot or swapped their day jobs. Speculation is rife as to why Downing Street felt the need to move Iain Duncan Smith – one of the architects of the biggest welfare shake-up since Beveridge and the man in charge of reducing welfare expenditure through unpopular policies like the benefit cap and the u...