Welcome to this user forum.
Until you get a working phone line installed, its not going to be possible to determine what broadband options are available.
As you mentioned a cabinet, I assume you are talking about FTTC, not FTTP?
If there are existing ADSL connections in the new houses, then that is likely that its a copper feed not a fibre feed.
If you know any of those people, and their phone number, then try the number in the
Have the people opposite actually got FTTP or is it just showing FTTP on demand, which is a totally different product?
I suspect that in your case, only a copper feed from the exchange is availabe. ADSL2+ can be very good, if the exchange is nearby.
I was assuming it wasn't On Demand due to BT offering all their infinity packages if I use the postcode from across the road.
This is what BT offer on their website for accross the road: https://www.dropbox.com/s/x0p654z3gfx1bnj/BTFibre.png?dl=0
Starting with Infinity 1 through to 4.
It would be best to use the availability checker. Use the postcode and address if you do not have a phone number fro across the road.
This is what I get on the Openreach checker for the existing house directly across the road: https://www.dropbox.com/s/5cyz5o9joiuf45m/FibreAcrossRoad.png?dl=0
And this is for the existing address (with someone living in it on ADSL): https://www.dropbox.com/s/spp1zwbmc5f7v9q/FibreNewBuilt.png?dl=0
Could it just be a database issue due to the new properties being on a new postcode or is it likley there is a genuine reason for FTTP not being available?
They are not screenshots from the Broadband availability checker
Can you please try that one.
By the way, you can upload pictures to the forum, and it makes things easier for people to see.
Here is how to post pictures.