Welcome!!

Graham Heane is probably the closest to you - somewhere around Taunton.

I have a jap import silver over dark grey - when it needed touching up, I took it to the local auto paint factors where they kept it for an afternoon, matched up the colours and made up 2 spray cans of each for me. Less than £30 if memory serves - damn good mach too. The code is on their computer now so all I have to do is call in and they can mix another batch for me. In fact, will be going their soon, as the same shade that is a good match for the bumper is slightly too light for the door, so will let them have a tweak at the formulation.

Good luck - hope to see you July.

Tony