Yes- I feel the same about the cost! I was thinking to myself I might do it in my 50s, as in a few years it might have come down by then. I mentioned it to my GP and he said 'not on the NHS' but he did something else which seemed to be a test for Creatinine levels. Not really sure why or if is related.
I have got this healthcare which is kind of discretionary and covers things the NHS do not, but don't think it would cover it, not sure. It says there needs to be a 'clinical need'. Hmm. the other thing I have seen advertised is this home testing kit which tests for folate, HB1AC, and cholesterol. It seems to usually have a discount code on it if you check online. https://thriva.co
Discount code online seems to be FIRST50 which is valid until November this year, for a first test. (they want you to sign up to 3 monthly tests but you can cancel after the first one)
I mean it is kind of basic but it would give some things to start with.