Thanks for the replies everyone.
We currently don't even have a connected line. Last time an engineer was here he plugged a line length measuring tool into our socket and said it was only 60ish metres. I expect the old lady who lived here before simply didn't have a line for years. So I suppose I'm free to pick a new line from TT or BT or whomever.
I used to have an account with TT Business and the connectivity they provided was fine. In fact I can't remember a single fault over the 4+ years. But their customer service wasn't so hot, even with an account manager (maybe everyone gets one of those too).
We currently have internet via 4G from EE. It can be patchy. Speeds vary a lot, jitter is terrible, the "4GEE mini" needs rebooting often as it increasingly borks TCP connections the longer it's up. It's connected via USB to another router so we don't have to use any more of its features than necessary! It would be 'OK' as a backup line if we install FTTC, RobertoS. You make a good point about the work vs consumer aspects.
AA are increasingly looking like the better option now though. I can't see myself using more than 200GB each month and use my mobiles for calls so that's fine.Reading AA's broadband incident blog makes for a grim view of TT.