I think all you can do is wait for the database to be updated. The cabinet doesn't appear to be full.
It is FTTPod rather than FTTP and orders are not being taken for that currently. Even if they were, the installation costs run into many thousands of pounds.
@DavidM I got a phone call from you to to tell me that you can't do anything because my address is listed as flat 1-2.
from Royal Mail:
"Our postcodes on-line service at www.royalmail.com will reflect this within 24-48 hours, although corrections/additions to our database can take several months to filter through to end users of Postcode Address File data.
This property is now registered as having a multi occupancy of 2 flats. Flat 1 and Flat 2.
This means they share a communal mail delivery point, therefore there can only be one listing on our main database. However, both flats are listed individually on our multi occupancy database, which is available for purchase by external companies. We have no jurisdiction over whether or not these external companies purchase the database.
Our postcodes on-line service at www.royalmail.com will reflect this within 28 days, although this correction can take several months to filter through to end users of Postcode Address File data.
We have no jurisdiction over how often external companies update their databases."
Apparently this is how it's supposed to appear and that if you want to have both addresses for a flat that shares a single post box BT should be buying access to a different database.