You can pay anything from ?450-?2500. I had one done a few years back which was ?500 and at first it wasn't bad (not great) but as soon as winter came the paint started to flake off. The next one i had done was ?1200 and it was spot on. The more you pay the better it'll be. Make sure that who ever does it takes the windows out and everthing is masked up properly.
I do my resprays myself now, works out soooo much cheaper..... good luck mate, merry Xmas to you too!