SC Auto Electrics in Bolton. The owner, Ste, is the guy that's put about 10 Megane 225/250 engines into Clio 197/200s. Probably a bit closer than Birchdown.
Closer? How do you know where the OP is based?
Ive heard good things about Ste to be honest... Birchdown are traders on the Forum if that makes a difference?