Paying a ransom is already illegal sometimes
Under the Proceeds of Crime Act 2002, and the Terrorism Act 2000.
https://publications.parliament.uk/pa/ld200809/ldselect/ldeucom/132/9031112.htm
And frankly, if my mum was in an ICU that got "shut down" by ransomware I would still be demanding that they do NOT pay any ransom.
If only because I could not possibly trust any of the "decrypted" files.
Nuke the site from orbit and restore from a backup. It's genuinely the only way to trust the system ever again.