When was the last time we spent enough on Defence and Security, the nation’s insurance policy? The problem, of course, is that democratic nations decide the answer to this question through elected politicians, not the military; many wise people are involved in reviewing and offering their best analysis of the likely future turn of events but this, as history regularly reminds us, is an inexact science. It all boils down to how effectively we communicate the power of the argument – articulating the threat and the likelihood versus the size of the purse and the amount of risk a government is pre…