On Saturday, 4 August 2018 09:49:16 UTC+1, Dave Liquorice wrote:
The combination of BT's directory database
Assumes people have telephone service from BT.

Directory Management System (formerly OSIS) Listing
The Directory Management System database contains more than 27 million residential and business names, addresses, and telephone numbers supplied by over 80 UK Telecommunication Providers.
https://www.voipfone.co.uk/PB_osis_listing.php
https://www.btwholesale.com/pages/st...-solutions.htm

... and the national address gazetteer (which I think has geodata)
should already provide the first.
Does that distinguish between "permenantly" occupied, second homes,
holiday lets?

No, but any of them may have hungry people stuck on the roof.

There is also the Royal Mail delivery point database, but that excludes normally non-deliverable places like village halls, which is unfortunate as they're quite useful places to know about in an emergency.

Owain