Firebond tend to be the most recommended company that I've heard of (and not just around these parts, although they do happen to be just a couple of miles away from the centre of Cambridge. Max Power and the rest tend to name drop them on a pretty regular basis). Trouble is, the car crime rate in the UK, and the type of person stereotypically associated with expensive ICE has pushed premiums way through the roof.

Dominic

Cambridge Car Audio
http://www.cambscaraudio.co.uk