I have been with PlusNet for the past fiver years or so. I must confess I do not recognise the service apparently received by most reviewers here, though I was unaware that BT had taken them over.
For me the service has been seamless and any time I have called them I was well pleased with the response. I should nevertheless add that I have not had occasion to call them for some time, so that aspect may have diminished in the interim.

The costs are pretty good, and I have not seen any better that I would consider changing to at this stage.