The big fibre cabinet, associated with NIHB_P1, contains a Huawei MA5603T MSAN (used only as a DSLAM). As that cabinet has not been physically extended, to allow for more tie-cable pair terminations and associated low-pass filters, its maximum capacity is for 288 end-users. (Six line-cards, each card with 48 ports.)
If I were in your present situation my choice and, thus, action would be to leave Vodafone, as a priority, within the 30-day period. If it means dropping back to a G.992.{1|3|5} service with EE, until such time as a port for a G.993.2 service comes available, then I would do so.
I have forgotten, hence the next question: What service could you obtain from BT Consumer?