Symmetric 1Gb/s via CityFibre - £20 pcm (+£2 each April)

Nearly 3 months in and I'm a happy customer so far.

Some administrative bumps with the install but the physical work by CityFibre was fine.
Once in and running I was impressed with the speed.

Supplied router (Linksys SPNM60) was fine (firmware a little basic). Good hardware specs and both ONT (10Gb) & router ready for 2.5Gb/s so easy to upgrade package in the future.
Annoyingly, when enabling/disabling the guest network the router re-assigns the first IPv6 range from the prefix to it causing the main network to renumber.
I replaced it with an OpenWrt router and hope that soon OpenWrt will be available for the SPNM60.

Service has been very reliable for me with only only 1 interruption that affected many other users. Seemed to only affect IPv4 (so perhaps CGNAT related?). Reddit users have reported more problems, even in my town, but it's been good for me so far.
IPv6 prefix has remain the same as has the CGNAT IPv4 address.