I've been extremely impressed since joining Unchained ISP on their top residential FTTP service of 1000Mbps Up / 115Mbps Down, which is provisioned via the BTW network on an Openreach FTTP line. I've previously had FTTP services from Zen and AAISP. I took the top package with Unchained ISP, which was very reasonably priced (similar to Zen, much less than AAISP), and has no usage limits. It came by default with a static IPV4 address, and I was able to upgrade with some extra static IPs for only a few pounds.

I've been very impressed by the performance; usually single threaded iperf3 tests to various locations across the UK and Europe are testing very close to the line rate, and latency is also excellent, averaging around 6-7ms to London servers (I'm in Norwich). The service has been rock solid since installation.

There is a well-organised support portal where queries are answered very quickly, and also a broadband portal that allows me to see live monitoring of the performance of the line, and make changes to various parameters. During the initial order, setup and following up I've had various interactions with Keith, which have been both prompt and very informative.

I'd highly recommend Unchained ISP if you are looking for a premium experience with personal service. 10/10.

Update 2/2024: 5 months in, service has been impeccable. Perfect ISP.