I have used this guy in the past and not only was he highly recommended (by another firm) but he was very happy to talk me through the whole alignment as he set it all up and adjusted it.
His prices are also very, very competitive.
You are basically getting a top of the end 4-wheel LASER alignment for standard prices.
This guy sets up race and track cars too, so he knows what he's doing.
His details: http://www.fcmalignment.co.uk/index....id=1&Itemid=68