Yeah, things are getting better in the UK. Even a year ago it was pretty much only the major EE/Vodafone/O2/Three direct providers that offered eSIMs and none of the best known MVNOs offered them. For me the MVNOs tend to be much better value than going direct to the big 4 so I was worried. Checking just now I see at least one of the big UK MVNOs now offer eSIMs e.g. Giffgaff.
The MVNO I’m with (Lebara) is saying that it’s launching eSIMs in Q3 2025 so in theory that’s by the end of September if they stick to that timetable.
I usually but a new iPhone on launch day so if the UK iPhones are going to lose the physical SIM slot then it’s going to be a close run thing. I really hope Lebara does get its act together in time for the first iPhone 17 deliveries.