There's a fixed budget for new connections, and anything that involves digging across a public road usually comfortably exceeds that allowance (I guess around £600 tops). There's cost and effort in council permits for new infrastructure (£££), traffic management costs, job mobilisation costs for civil contractors - simply digging a narrow trench across a tarmac road and reinstating to highway grade is probably around £250 per metre these days, then you've got to dig across two pavements as well. The cost of the household installation itself (laying cable across the garden, wall connection box, drilling and supply of a VM hub is probably around £100 on their own).
I'm guessing somebody's looked at a map and realised they can't do it within the budget, and so there's little point sending out spotters and or a works surveyor but organisationally VM are incapable of customer communication on anything, and particularly reasons that they won't connect customers. Things might change if you can get multiple neighbours to commit in writing that they'd take VM services as the cost per property of the whole job will be lower, but even then VM are very poor at any type of special arrangements, and there's probably a need for an access chamber or two on your side of the road, adding say £200 per pop.
Sometimes they can connect by running a VM cable through existing Openreach ducts which would avoid most of the digging costs, but that's not done universally and relies on their being Openreach ducts in suitable places, and space in those ducts. I don't hold out much hope of this being a solution for you.
I could be wrong, I think you should consider that VM probably isn't an option, because no matter how small a job it looks to you, anything involving streetworks is expensive.
