Thanks all for the info.
Let's hope some of their users also find their way here to post their experiences, issues, or other views.
I am now with CommunityFibre, been with them for around 6 months.
I was waiting years for BT to upgrade my cabinet, they finally completed the upgrade within a couple of weeks after i signed up with CommunityFibre and to my surprise i actually still can't get BT FTTC as i'm to far from the cabinet apparently, but at this point i didn't care as CommunityFibre was my saviour.
Like you i couldn't find much info on them either but overall i'm very happy with their service, I did have a intermittent connection issue (high latency) around 1 month in which lasted just over a month due to not happening all the time so was tricky to track but once it started to happen more often and get a bit worse when it happened it was resolved quickly by the support and technical teams at CommunityFibre.
beyond that there was two downtimes iirc due to 1. power outage and 2. really heavy rain both times the connection was back up fairly quick.
So yeah overall uptime and connection stability is solid especially compared to the ADSL2+ supplier my previous ISP had me on.
I'd definitely recommend/consider them if they are an option for you in your area.