I recently switched over from BT fibre to Andrews & Arnold when my original 18 month contract expired. I have been with a bunch of ISPs over the years before switching to BT for fibre: was on O2 for quite a long time on the get it as cheap as possible principle, but decided that paying more for better service was worthwhile.
I have had an ipv6 tunnel service for some years now, as I use ipv6 for technical stuff. So switching to native made sense; BT seems to have no intention of providing it.
BT also seem keen on spending on sports rights not good internet, and I had to work around their poor technical choices (no ipv6, DNS hijack, poor routers, censorship).
Switching to A&A was very simple, BT offered me a discount to stay, I got updates on what was going on, and it just worked on switch over when I reconfigured my router (I already had a good one running openwrt which I had got instead of the BT one so I didnt get one from A&A).
The internet service is noticeably faster, lower latency and much better performance on video streaming. I get the maximum 80/20 connection, and the diagnostic info in the system is very helpful in case anything goes wrong. I haven't had to use the support yet but there is already a log in the system of all the stuff from setup and and changes I make. There is great attention to detail (gpg signed bills). Although the service probably caters largely to a tech audience, it is a proper service that does not try to dumb anything down. You pay a bit extra but that means the business is sustainable (the last ISP like this I used, Black Cat years ago, stopped doing broadband as it is unprofitable).
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