Private Road but Checker says we can get 1G Full Fibre - I'm sceptical, how to check 100%?

Hi, I live in a short private road (X on the first pic) to a telephone pole (Y, about 50m from the closes public road) and am the last of 8 houses (Z, a further 12m or so) served by the pole and good old copper wire. This is sufficient for 65mbps part fibre. All of the house on the main road have access to full fibre.

The checker and a sales person in chat has confirmed their service is available to me but I am wary of this as I have read here (and sadly had experience with) the lack of comms between departments.

I do not want to place an order just to find out on the day that it's the same speed I can get with my existing part fibre connection. If I can get 1Gbit I'll sign up.

I count 8 lines for 8 houses so I guess there is an underground main cable back to the network?

Is it possible that VM will use a cable via the pole in our road?

How do I request someone to come and check this personally?

I would have signed up ages ago had this been clearer but am coming to the end of my PlusNet contract and while I cannot fault their service, this speed (specifically upload) is just lacking.

Wayleave is a possibility as I now know for certain who owns the length of the road (a business situated the furthest to the right on this map).

Thanks