There are two laws of interest here [1] (in the original authoritive source .gov.uk release)

One law applies to both England and Wales (not to Cornwall, Scotland, or Northern Ireland).

The other applies to England alone.

Neither applies to the whole of the United Kingdom.

[1] https://www.gov.uk/government/news/millions-of-homeowners-an...

They both apply to Cornwall as it is part of England.

It is?

Damn shame, I'm sure there'd be a few that wished otherwise.

My bad, I'm thinking pre Henry VII times when it had more autonomy, not that I have skin in the game being Australian with non Great Britain roots.