Re: Bust-up
http://en.wikipedia.org/wiki/New_Routemaster puts the cost of a new RouteMaster (aka 'Boris Bus') as £354,000, so those 470 units would come in at about £170 million (assuming no discount for bulk).
http://www.bbc.co.uk/news/uk-26124894 gives the cost of an F35 at around £60m per plane (£150m+ if you allocate infrastructure, training, support etc.)
So, somewhere between 1 and 3 strike jets, or 470 buses. Now there's a strategic decision worth pondering, particularly if we could have ex-Gurkhas as conductors and Boris himself driving the lead vehicle through the gates of Kabul...