Most anywhere will mix some to the paint code stamped on the plate under the bonnet (assuming it is still the original colour). I had some mixed by a local body shop to match the Mica blue V8s purely by quoting the code and it was spot on.
Thanks it was the local scratch repairer. I wanted to do the front stone chips ready for the spring. They could not match against the paint code on the plate, but they have managed to get some now!