Your local area is being FTTP'd under the 'Retro New Sites' (RNS) programme. A number of addresses on Blackbrook Rd have been captured under one of the FTTP surveys, but also a small cluster of them haven't, (the lower numbers, ie: No.1, 2, 3 etc).
I can only guess at this point, but it may be that there is no 'hook up' from the underground duct from the premises that have been surveyed, and your own duct on the premises that haven't been ?? There obviously is a duct path back in one direction or another, as you have copper cable already in place and all the ducts for this small area aggregate back at Beacon Hill Rd.
Like you say, absolutely nothing at all to do with the Cabinet, and I would humbly suggest this has been a simple oversight. I would certainly progress this again, as it should in theory be a quick-win for all parties as capacity isn't the issue.