I saw an ad for this recently and thought it might help to share.
Ovesse is the brand name of the 'old' Ovestin, now available without a prescription (same as Gina is the OTC version of Vagifem.)
It's available in pharmacies- not cheap as it's showing as £19.99. The website says the pharmacist will 'make sure it's ok for you'.
I know the retail price for Ovestin on a private prescription is around £8.
But if you run out and can't get a prescription, it's an option.