My mum's just had the sills done on her Flame (89) and was recommended by a local garage to go to Ron Bells place in Hooton.  Well I was very impressed with the work done - proper sills not cover types.  They even patched the inner sill and sorted out a bit of perforation near the rear wheel arch.  Both the sill and touch up of the arch were painted and the sills then stonechipped (underneath only).  A fantastic job!  And best of all they like minis!!  Rons son Darren is an enthusiast and has project minis in the pipeline.  Very reasonable prices too - I'll definately be using them.
 
Ron Bell & Sons
Auto Body Repairs and Refinishers
Units N, K3 & L
Roften Trading Estate
Hooton
South Wirral
CH64 7NQ
0151 327 2743