Paint shop swindon area for off colour

[jvr]

Well its not 'off' but my 996 has a different shade on the bumpers. These were resprayed at some point in the correct colour according to the charts(there are two numbers in the Seal Grey).Now this coming up a slightly more hue of blue ,not much but it does show.
So the question is does anyone know who can get the paint to match the rest of the car without resorting to painting 4 wings and a bonnet to get a match for the bumpers.

Cheers

P