Paint Job-How much ????

I have given a front passenger door for my P38 (thanks Holmesbus) to replace my own which has a few small spots of corrosion (Acne ??). The door is in excellent condition, but obviously the wrong colour..dark blue metallic whereas my car is Willow Green. I am thinking of getting the bottom half of the car, up as far as the windows resprayed/blown over Willow green.
Any ideas as to how much it's likely to cost, the rest of the bodywork is in excellent order. I can get the car done either in the UK or over here. Prices I feel would be more competitive in the UK.
Finally, I have stripped the door and I have all the fittings, colour coded mirror, speakers, latch and handle, speakers etc., door card is knackered though, if anyones stuck....just pay the postage.

I had my drivers door done for £100

I had my whole offside painted (got key'd deep!) for less than £400, but that was mates rates. Most of the places I was calling for quotes were saying something between £650 and 900.

So at a rough guess I'd have thought the whole 'bottom half' of the car would be at least a grand.