@ z1ts,
There are a couple of small additions to c6em's excellent advice .
1. IF cabinet 7 is to be enabled in the next quarter it is likely to be shown on the BT Wholesale estimator with an anticipated estimate date. However that does not preclude a further postponement. It will be worth checking the estimator again after April 1st.
2. If you local community is fed up with waiting for BT and has some very determined, influential and wealthy residents it's not impossible (but unlikely) that another provider such as Gigaclear might do the job properly with FTTH, if non-BT fibre is close enough. Occasionally that goads the behemoth into activity too, perhaps to attempt the other's demise.
Kind regards,
Walter