Lots of government funded private 5G networks in the UK. Asset management, smart home monitoring for publicly owned property type systems rather than a replacement for consumer mobile data.
There are also a lot of mixed solutions (Satellite backhaul to Fixed wireless access to 4G) rather than 5G due to performance over distance, 4G/LTE still has a long lifecycle. 2/3G will be binned at some point.
So little data use on the island it’s difficult to understand what the need for 5G is. Those thinking it’s a rival for Fibre, so is 4G. If you can’t get great speeds on 4G you are never going to get great speeds over 5G.
The difference is the ping, although there will be huge fluctuations in performance based on variables like subs on a particular cell, building materials etc for indoor use.
There are a couple of 5G cells live but not flagged as 5G (LTE). There’s no noticeable difference on a mobile data device.
Roaming in parts of the UK where you can actually get a signal isn’t much different on a mobile device than 4G or free WiFi.