If there isn't one with the above machine near you, try your local Kwikfit. I wouldn't recommend them for anything else, but the Telford branch did an excellent job of four wheel alignment on my modern. They have the latest Hunter equipment which displays the settings in the waiting area and the technician called me in to the car and explained the problems and what he was going to do. He then adjusted it all within tolerances for a very reasonable price and provided me with a before and after printout. All for substantially less than £100.
Your problem which you recognise is that you do need the original specifications against which it can measured.