I use a company about 30 miles south of London called " Johnsons " in burgess hill
They might be a little further away than you ideally wanted but the extra mileage would 100% be worth it.
They have over £250,000 pounds worth of spray booths and work on cars from the Bentley owners club, Porsche uk, classic Volvo owners club.

they have a portfolio of classic fords including a s1 s2 rs turbos mk2 Granada and cosworth ground up resto's and are currently doing a Capri 280 special and moonstone 3 door that the bosses son owns.