We've blown the defence budget

Robert Fox writes on the massive scandal that is defence procurement in the UK. A theme often returned to recently but needs to be repeated again and again until something is done. Fox asserts that of equipment currently on order only 2/3 can be afforded. Even a large increase in the defence budget will not fill that gap (not that that is likely to happen). Amazingly the MOD Civil Service is 87,000 strong, larger than the RAF and RN combined. What exactly do all these people do?