Had a curious one.
As I no longer have my Plusnet line but the drop wire got replaced a few months back, also seeing an improvement in my Zen line statistics, I decided to try to get the banding removed.
Zen got back in touch saying the system wont let them reset DLM as its not recognising the service ID.

They're going to try again but said they might have to raise it as a fault which seems overkill for a DLM issue. Any idea whats going on here?
They did seem to suggest its still a TTB line, does that mean they have to get Talk Talk to request the DLM reset rather than doing it directly? Bearing in mind my physical line rental is still BT Basic.