I know I am late to the party on this one, but I am genuinely gobsmacked I didn't know this, so I am sharing for any other similarly clueless women on HRT.
There is an NHS HRT Prescription Prepayment Certificate (PPC) you can get for £19.80, which covers all of your HRT prescriptions for A YEAR!
The lovely pharmacist told me this today and then waited as I went online and bought it. It cost the same as my 2 prescriptions would have today and will save me £100s in the next year. There is a slight caveat in that not every single medication is covered, but there's a pretty long list of meds that are.
Anyway, if you already knew about this, then I am delighted to join your knowledgeable ranks, but if you didn't, here's the link to see if your meds are covered and to get a PPC if they are.
https://www.nhsbsa.nhs.uk/help-nhs-prescription-costs/nhs-hormone-replacement-therapy-prescription-prepayment-certificate-hrt-ppc