Thank you all for your advice.
I had previously visited the opticians nearest to me. I have contacted the stores in Walsall town centre now and both Specsavers and Vision Express have confirmed that they are more than happy for me to bring my pistol with me for the test and that there will be no additional cost for fitting the lens to my "specialist" frames.
Just so I understand correctly.
If I am tested using the pistol, is that the prescription that I need or is the +.5/.75 still required? Or does that only apply to a reading prescription?
Anything else that is relevant that I need to convey to them?
Regards
Chris