anyone but Canonical
your comment is excellent but for one thing. Canonical
They appear to want to be in everything these days and IMHO in danger of becoming a master of none.
If Linux was to be used then IMHO it would have to be either RHEL or SUSE.
RHEL gives you a 10year support like OOTB. That would be the sort of metric that the NHS cares about, not the latest whizzo idea to come from Canonical.