Know the guys at powdertec, They send wheels down south to be done. 7-10 days. Good job but can be a pain if you haven't got spares.
I got quoted between 85-95 per wheel from diamond wheel tech. I asked if they could turn around in the same day, they said they could if I went up early enough, this was for 19" audi rotor alloys. Based in Dundee
Wheel specialist in East Kilbride, they now have a diamond cutting lathe so wheels done in house which means a much quicker turnaround. Had my rotor wheels done here recently. Satin black with diamond cut edges