Set the eSIM as your primary data plan while abroad (you can still receive texts and calls to your UK number if needed). Keep an eye on your usage or buy a slightly larger plan to cover streaming and ...

Mint Mobile is a good example, and it runs on T-Mobile's network (though it was later bought up by T-Mobile, but that's not the case for all MVNOs). Mint might not be the biggest player in the market, ...