Hi sorry it took so long to respond - been away for a while!
DANDAN - I got my Dremel out with the little grinding wheel and took it back to the metal, then coarse wire wool to start reducing the scratches, followed by some wet emery to really take it back to a clean finish. Then finally a good polish with Autosol.
Sounds harsh but the dremmel worked a treat on the really stubborn sooty stuff
And... CoolHandLuke - the wheel refurb was done by a company called WheelWorx near Fordingbridge in Hants.
They did a top job and were a nice bunch of guys....
Hope that helps
Looking at getting the rear bumper colour coded, same on the side skirts and the front splitter in the next few weeks!
Only thing holding me back is it takes a £400 chunk of cash out of my turbo back Milltek exhaust fund