To overcome the limitations of CG-NAT IP provision on EE's 4G network, I use Andrews and Arnold's L2TP service. This gives me a fixed IP address which allows me to port forward to a home server.
The service is priced fairly in my view and has been rock solid both in speed and connection reliability.
Customer service is rather clunky. Much of the self service is accessed by two separate login portals, which themselves are different to the connection details for the L2TP service. Thankfully a lot of the service "just works" which means the extra time taken to reset my password for each forgotten login, is minimal!
My overall impression is that this is a service run by geeks for geeks and focusses on value and performance over pretty CS portals. That is fine by me.