A very brief update on this that nothing has changed in the past month, no recent work on one.network and all checkers showing same thing's they did in early December.
So not sure where in the process it is, hopefully some movement in Jan...
Another update, again brief but this time positive!
Checked today and the BT wholesale tracker has been updated for WBC FTTP, and I was able to place an order via bt.com for the 900mb fibre package.
The Openreach checker also reflected this and showed I had full fibre available. Up until yesterday it still said there were no plans to upgrade my area.
Installation for 8th March which was earliest time available.