well, here's the thing
The sales rubbish says "39 Mbps - 40 Mbps"
The Wholesale Checker says 80Mbps which i posted about and you and i both exchanged emails and identified a fault with the checker.
However they let me order fibre large and are convinced i should be able to go faster (which will be based on the wholesale checker).
Either way they've still identified a fault on the line but i was somewhat sceptical when they went on about the battery!
I seem to be on an interleaved profile at the moment even though the first sync on Fibre was on the Fast profile so i guess DLM is all over my line at the moment. From what i can see on the TalkTalk Router (which is limited information) the line was stable and i'm not getting drop outs and couldn't see a load of errors!