Cough - you can blame policians and consultants alike for that
Since the early day of New Labour there has been a drive to "privatise" services. Now you can see what was really going on. By privatising civil servants, the clever ones jumped for better salary, so extracting the knowledge from the civil service required to take any intelligent decision (I take it as read you cannot expect that from most politicians). Ergo, a HUGE boost for consultancy because they need them to decide what to do, and I don't think you need to guess what the answer is from any consultancy: hire more consultants!
This is also why I keep laughing about the IDcard fiasco: anyone with half an ounce of intelligence knows that the Chinese walls in a consultancy are at partner level more like Japanese walls: paper thin and not very effective.
I think the spending cuts are a good idea, but too late - the obvious aim is to leave the Tories short-handed when they come in. Well, nuke IR35 and get contractors instead. None of the overhead but plenty of skills as they cannot float one the "we're so big we probably have people that know everything" myth..