See if Andrews & Arnolds would work wherever you move to. I've been with them for a few months now and don't think I'll want to switch anyone else afterwards.
https://www.aa.net.uk/
Checking an address on their website will require active BT phone line at the address, but if you call them up they can check the area for you (I did that).
I was asking their salesperson about static IPs addresses and all sorts. Answered every single one of my question with legit technical information.
I was actually speechless at the end of the first call. Was the first time I've spoken to an ISP and had all of my questions answered.
Didn't want a phone line and they didn't require one, 300GB usage as standard per month (can be upped to 2TB for a tenner I think?). They dont filter content on their network either. Speeds are decent enough for one person on FTTC (just got 70Mbps). And apparently they purchase above and beyond the capacity they might need from openreach to avoid peak time drains on the network (I've experienced none).
They also do FTTP as well. Or there's the G.Fast option which seems to be new (wasn't there when I ordered).
One of the things that still amazes me - they send me an pgp signed email whenever my internet connection drops, and another when it comes back online. If it's dropped overnight, I wake up to an email about it!
Then there's the amazing logs which you can see about your order. I can actually see the status of any issues relating to my account -- including what openreach may have logged about it!
Had a dodgy moment when initially setting up the router (unexpected downtime on their end).
Called support and they answered straight away - and it turned out to be the person I was emailing when purchasing my order! Knew I was doing set up, quickly checked logs and we got it all worked out.
No major issues since then. Only issue is the socket in my flat, but that's an openreach engineer job.