318 is way too high for that mate. I think the local shop I go to will get it sorted within 100, mind you he hasn't have a proper shop but he does a really good job for small money. Too my mini there once to get something similar sorted, 50 quids and I can't tell it has been resprayed if I don't try really hard. My colleague introduced me to this guy, in a wooden shed enough to fit just 3 cars with a spray room inside. Not convinced to start with but definitely impressed with his work and unbelievable price. He quoted me £120 for full front bumper respray on the zed but I decided to get it done in one go including the bonnet.
Having said that, you might need to travel a long way. West Yorkshire? 😎
Ask around, I'm sure you'll find some lower price garage. Good luck mate.