Depends if you're looking simply for alignment (in which case, all garages tend to check is the tracking and leave it at that) or a full geometry (taking into account camber/ caster/ toe etc) in which case you'll need to look further afield.
"Alignment" costs very little, but expect to pay £80 for a geometry... which is not bad considering the difference it can make to your handling. I go to ProGrip in Bonnybridge... John is a great guy, has all the best kit and sets up some of the fastest race rigs in the country. Worth the trip.