Some years ago my works ADSL line was supplied by TalkTalk Opal (now Business).
The service itself was fine.
When I had a line problem, reported via my employers help desk, OR opened a chamber and fixed the problem in less than 24 hours, keeping the help desk (and hence me) informed throughout.
No idea what they are like nowadays.
I have 2 AAISP VDSL connections over TalkTalk, and one is fine. The other has periods of instability which I just live with.