> Sure there are advisers and whatever but surely before you approve say a £10B pound submarine project you should know something about submarines, who builds t

> Sure there are advisers and whatever but surely before you approve say a £10B pound submarine project you should know something about submarines, who builds them and what is a reasonable figure to pay? I think you kind of answered yourself. No one can know everything about everything, that's what "advisers or whatever" are for. Their job is to educate the advised enough so that they can effectively make decisions, which is what they're (supposed to be) good at.