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If you don't find one that comes very highly recommended in your area then make the effort and travel a little further. It's only a one off install, and prob not cheap, so in my mind it's worth the effort to have the right guys fit it. Some 'Authorised Dealers' just don't have a clue.
Never used them myself, but I have heard that Gary Moore of Moore Sounds in Kinning Park is quite good. Pretty sure that he does Clifford. Maybe worth a look?
Try Drivers in Glasgow. They are a pretty decent dealer and have been dealers for as long as the product has been coming in to the country. Nice shop as well.
Regards.