West Yorks area? Tell me more please.....
There is a powdercoaters in Ecceshill, Bradford, called 'Cas Coatings', which do a very similar finish, which is about £50 per wheel for 18" if im correct. My friends uses them all the time for wheel refurbs at his garage, so can get discount, drop him aline, his garage is automotive cars in Keighley - Graham Cox is the owner.
P.S i am in no way connect to this garage, simple passing on forum knowledge and help.