They don't have free speech in the United Kingdom. Theoretically, one could get life in prison for advocating for the abolition of the monarchy, though in practice, it is not going to happen. See also:
https://en.wikipedia.org/wiki/Freedom_of...ed_Kingdom
https://en.wikipedia.org/wiki/Freedom_of...ed_Kingdom
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.