It's also a site that hasn't allowed any other providers to install their own network/ducting so Persimmons own FTTP is all that's available via their ISP FibreNest.

I think this kind of thing is going to be happening more and more. Not good, not good at all.

My Son recently got a new build and the builders were happy to install the back boxes, Cat 6 cables and end all cables to a cupboard under the stairwell beside the ONT.
I did all the terminations, ethernet outlets, switches and PoE AP's etc. so he's a happy chappy.
The builder was quite affable about the whole process really and didn't over charge either.