There will be, say Peter Mandelson and Geoff Hoon, "help worth 2,000 - 5,000 towards buying the first electric and plug in hybrid cars when they hit the showrooms", and these are the headline numbers they'd like you to take away. This funding, however, is part of a "250 million scheme to deliver a green motoring transformation", and it's at this point that it all starts to come unpicked.