I think raising with your travel insurer is the best advice, and also checking if the UK has a reciprocal healthcare agreement with the country you're in as that may make it easier to see a doctor if needed. Also I'm not sure if the UK is still included with Brexit but a prescription from one EU country is recognised as valid in all other EU countries.
Originally Posted by
corporate-wage-slave
UK's prescription rules are tighter than almost anywhere else, Australia is the only notable exception. So I think you probably would be able to get your medicine elsewhere. So many NHS drugs are freely available in overseas pharmacies.
Not to dive too far off-topic, but wanted to give a counter example that drives me insane about the UK... Fexofenadine, an antihistamine for hayfever, freely (and cheaply) available in pharmacies and supermarkets in Australia, is a prescription only drug in the UK. Also another thing that surprised me about the UK - limits on pack sizes. It's common to see 100 packs of tablets like paracetamol and ibuprofen on shelves in Australia but not in the UK.