It might work for you, but I have countless examples of where EE fails for me:
- The underpass at Ealing Broadway station
- My son's swimming classes in Guildford (two different locations)
- Cwmcarn mountain biking centre in South Wales
etc etc.
If I could find a Vodafone eSIM for £2.49, I'd sign up in a heartbeat. The cheapest I've found so far is £5.95 with Talkmobile.
The mobile coverage in the UK is diabolical if you've travelled to other parts of the world like Japan.
EDIT: I think I found your £2.49 deal
here.