This is the main problem, there is no tee point just off your boundary specifically.
Typically you find a tee point outside each property when there's service there, but I know one tee point could in theory have multiple cables coming from it, my mother in fact has this situation, the tee point is situated outside next door but there are two cables come from it one going to next door the other to her property. I was naughty and lifted the cover off as I was confused as to where the connection from the exterior wall was come from. Whether or not that is technically correct as this going back a bit in terms of ownership pre Virgin Media, that's another question.
You probably shouldn't be touching the tee point as it's on the footway and hence not owned by you. To cross boundaries and such you also need proper wayleave to do it officially. You are better off trying to approach Virgin Media to understand the specific issue with why they won't extend to you. Sometimes they will absorb the cost of any civil/construction work if they deem it cost effective, i.e. the work provides potential service to multiple addresses, in this case they feel it's not cost effective.
When you go through the Virgin Media website, does your specific house number and postcode identify as service available or something else?
Edited by jamesmacwhite (Sat 11-Jun-22 21:00:41)