Latest update after MUCH MUCH testing of various aspects of my services comes today....
"I've just been liaising with BT Wholesale and determined the following....
Your exchange Dapple Heath (WMDAP) is a child exchange of Uttoxeter (WMUTT). This means that your FTTP connection jumps on the BT Wholesale back haul at Uttoxeter.
The link between you and Uttoxeter only has one VLAN at present, and as far as I can gather, this VLAN is set to 500Mbps. This means that your connection alone, takes up 2/3 of this capacity.
The guys who I was speaking with at BT have passed this on to their Capacity Management team to see what can be done. They will hopefully be able to either increase the capacity on the VLAN, or, get new links added. If it's the latter (which I think is most likely), it may take a bit of time for this to be implemented, unfortunately."
It disappoints me that it has taken this long to get to establishing this, but I am looking at it as the route cause of my issue. Watch this space for updates, but I guess living remotely has advantages and disadvantages, but one would have hoped that if BT has made the service ready for consumers to buy, then they might have put the appropriate infrastructure in place to support it....but it seems not. I guess they did not expect people to jump in with the request for 300mbps services all at once when myself an my neighbour both went for that service because 'speeds init'