Gutted for you Clarkie, its seriously upsetting when that happens
If its any use to you a friend of mine used a place round the corner from me in Stockport called Diamond Wheels when he damaged one of his Superleggeras, a few places had said they'd struggle to match the colour but Diamond wheels did it perfectly so it may be worth a try possibly if you dont have any luck with the wheel specialist
http://www.diamond-wheels.net/index.htm