American Auto Services offer meaintenance and SVA work.
Also have some American vehicles and parts for sale.
They say:
Our S. V. A. work is second to none and we take pride in the fact that we do our utmost to keep vehicles looking as close as possible to their original design, while making the changes needed to comply with our laws.
American Auto Services
Elder Farm
130 West End Lane
Harlington
Middlesex
UB3 5LY
Phone: +44 (0)20 8754 1160