It seems that permits for lorries in to Kent are a QR code as well, and it seems they are really good at validating number plates?!
This decodes as:-
This is base32, which is somewhat nicer for QR code encoding as it fits entirely in the alphanumeric coding (which is digits, upper case, and a few symbols).
It decodes as two parts: some JSON and a binary block.
So, once again, a digital signature, but made to be a smaller code than the NHS codes.