The soaring cost of Britain’s military campaign in Afghanistan is laid bare today, as a comprehensive analysis reveals that the cost of fighting the Taliban has passed £12bn.An Independent on Sunday assessment of the “hidden costs” of fighting since the Taliban was ousted in 2001 reveals that the bill works out at £190 for every man, woman and child in the UK – and would pay for 23 new hospitals, 60,000 new teachers or 77,000 new nurses.