Did you find anywhere near MK? I know there is a place in Woburn Sands, but I think they are expensive. I need mine done, I got a price from a guy in Kettering of £190 for 4. I am in Bedford so am looking around now.
If a daily driver, try Exel wheels, as Chris can supply you a set of replacement wheels whist yours are being done. You won't get better quality than Chris.