I have a very good powder coater that I use in Bristol. He does all of my powder coating, charges approx £40 for F&F (can do any part you want not just F&F) and does all of the preparation work. He has about 1 week turnaround (dependent on when you give him the work to do).
PM me if you want the details.
Here is some of his work.
He did all of the blue on my Quad.
Black Frame, Forks, Bars and Rims on my old Pro Class
He did the white and the orange on my old Parkinson