Irish,
Be sure that the testing company is acceptable to the CAA (ask the CAA not the company). Perhaps the CAA certifies them, I don't know your system. Then, you will have to tell them which standard you wan the test to (depends upon certification basis of the aircraft - I can figure it out for you if you need help). No point in failing a test which is more demanding than that which is required, when you would otherwise have passed. f it is an older aircraft, it is probably a CAR 3 cert basis, which will be much less demanding.
Be careful what you ask for, because you might get it!
Good luck,
Pilot DAR