That is outrageous. Bearing in mind that it will take 6-8weeks for the car to turn up after that I would go and threaten to cancel the order unless they make it worth your while - I mean that seriously. Phyzzo threatened to cancel his and he got some concessions.
If you got it in May that'd only be a few months before the Focus ST becomes available which on the scheme will only be a bit more. That is if the Focus floats your boat which it doesn't for all.