Sitech's Simon Smail, (sas on here) is in Pitlochry and can turn his hand to most things..... I've been getting him to do a lot for me recently too.
You may know his Escort.....
Way up north there's Wallace Performance in Aberdeen, I shot their demo car a while back... the main main seemed clued up.
I have no personal experience of them, but they looked well kitted out, and they were real busy.....