We now have the option of City Fibre, it having been turned on last week. Several of my neighbours are already ditching Virgin. I had a look at the video explaining how it works, and there's a bit of an issue in the room where all our networking stuff is kept and that is a shortage of suitable power points. We are due to get this room decorated soon and that will involve lining the walls with damp-proof plaster board. I will also get them to put in some more power points, but that's non-trivial because it's a concrete floor - the rest of the house, bar the granny annexe, has floorboards, so the cables will need to be boxed in. So for the time being I think we will stick with our £14 per month Three 4g deal and hopefully get the decorating done in time for its second anniversary next January, and switch providers then.
Of course, if Three upgrade to 5g some time soon, then we might stay put, depending on the speed.