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Only one I can recommend personally in Yorkshire is Maximum Impact - he's looked after all my cars for a long time now , from a Morris Minor Convertible (yes, really) to a full Concept 600 and tracking install on my MY00.
Try SQ-Plus at Trafford Park, Manchester. Authorised Clifford dealers. Good bunch of lads, very trustworthy and do an excellent job. give em a call - 0161 748 1600.
About 5 mins from Trafford Centre so somewhere to go whilst fitting the system to your car.