Sorry, I should have informed you all of that info. Its the WSLON exchange (Lochmaben) and it was for ADSL2 + products. Fibre is not available to me.
From the look of SamKnows
, this exchange currently has BTW as a supplier of ADSL (not 2+), and Sky as a supplier, likely to be ADSL2+. So you need to talk to either Sky, or retail ISPs that are willing to use BT Wholesale ... so forget TalkTalk.
If Plusnet is refusing to connect you, then it is likely that every port on the BTW DSLAM(s) is occupied, with no way of adding more ports. That curtails that avenue ... until someone cancels their broadband.
That leaves Sky as the only other possibility for you, at present.
Of course, anyone could cancel their BTW broadband, at any time. If you don't want to choose Sky, then you have to keep trying with the likes of Plusnet.
Lochmaben has had 3 cabinets upgraded to fibre, so there is indeed likely to be a migration of users away from the exchange hardware, which *ought* to free up ports.
In addition, 2 more of the exchange's original cabinets are being upgraded and due to go live in the next few months. That too might free up ports.
Finally, an additional 5 cabinets are being added to the exchange to upgrade EO lines. Those are due from the autumn on into next year.