I don't have such a rich source as OP, but Ofcom have some information

https://www.ofcom.org.uk/phones-telecoms-and-internet/inform...

https://www.ofcom.org.uk/phones-telecoms-and-internet/inform...

The only thing I know of for the UK that's sort of similar (but not really), is this one:

https://www.telecom-tariffs.co.uk/codelook.htm

If you put in a landline or mobile telephone prefix, it can tell you which network the number was originally allocated to, but it can't tell you if the number has been ported.

Aren't all UK numbers owned by BT?