Why the f**k not? 12mths ticket for £27, the rest of the work (which you should know about) is done by you, no?
The only concern id have is at that price there probably looking for work. I do appreciate theres a manual to follow but some of has to be down to the testers discretion.
Had my seat done by Farmers Autocare (scotland) - he failed both back tires, my matewho is a mobile tire fitter came last night to change them and advised they still have 2.5 mm tread on them!