Camber probs in Central London

[bruce fielding]

I want to change the camber of the wheels on my track car, but can I find a garage that can do it in Central London? Can I buggery!

Any suggestions? (I've tried all the tyre places near me - fine for tracking, but not camber) Please bear in mind that I am technically illiterate and cackhanded, so DIY is not an option.