If my GP has no facilties to do an eye-test, could I take a recent prescription from an optomerist? Or not?
Don’t think so. The prescription defines the lenses needed. It doesn’t state how good your vision is using those lenses.
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I had my GP do the medical then went to the optometrist for an eyesight check…simples
oldwelshdude:
I had my GP do the medical then went to the optometrist for an eyesight check…simples
Simples!.. And quite expensive! But thank you. 
(Yet) Another thing to bear in mind!
A GP should have a snellen chart. I took the prescription for the glasses I use and everything was fine. The doctor may or may not require to inspect this. If your uncorrected vision is of a particularly poor standard (requiring large correction), then it may come into play more. The most important thing seems to be to meet the required vision standard either corrected or uncorrected.