Thanks again, guys.
I just went over to the property and took some photos of what I assume is the lines/pylons to the house.
Photos here
Basically there seems to be what looks like a fibre line (it says "Warning Overhead Fibre!") that comes out the ground across the road from the property - then it goes up a pole that feeds across the main road and joins a shared elec/phone pylon. Elec seems to be fed to the house from a pylon further up the road, but TWO other lines seem to come out of this pylon to the property - fibre and copper perhaps...? At least one of which seems to originally come from the fibre pole across the road (amybe both it's hard to tell).
This fibre pole and relay pole seems to only feed one other property on Park Road (called Ansford, CF64 4HJ) - opposite the one I'm looking at. And having checked on this address, fibre seems to be available there too - which I take as a good sign:
Address ANSFORD, PARK ROAD, DINAS POWYS, CF64 4HJ on Exchange DINAS POWYS is served by Cabinet 9
Our records show the following FTTP network service information for these premises:- Single Dwelling Unit Residential OH Potential Wayleave issues.
FTTP is available and a new ONT may be ordered.
I'm guessing all this looks promising to you guys...?
I'd still want to be sure - and a bit worried about the address/duplicate issues causing a mess up in ordering any service. Who would you advise I talk to next...?
I will try the chabox OR link gary333 sent to see if it works first.