It will done privately or during fertility treatment. I did mine with randox home test. The result may not be accurate but it’s not totally wrong.
Hi. Go to onedaytests.com, you can get a home kit for £75, or go to your nearest clinic (if there is one) for an additional cost of £29 for a blood draw.
I used this site for women healthy full blood panel (prior to TTC), check progesterone and estrogen, and also ordered some HCG blood tests to have at home. Loads of other things you can get checked, there are fertility packages as well, the full on one is quite expensive though, £350.
I think you can request one from your GP, not 100% sure though. I got mine done privately though before I got to see a fertility doctor.