There goes freedom of speech and freedom of religion.
Great Britain does not have a bill of rights. When the first gun control laws were passed in England and Wales, it was acknowledged that there was a traditional and historical right to bear arms for self defense.
Only a couple of British legislators said anything about it, and they were ignored.
> Great Britain does not have a bill of rights.
Well, the British do have bills of rights, some very old — the Magna Carta (1215), the Bill of Rights of 1689 (which contains such things as the right of Protestants to bear arms), and later additions that expanded them, both in number of rights and persons to whom they applied, e.g., the Catholics. The American Bill of Rights represented an advance on what was permitted at the time, though.
Obviously the preaching of Christianity as the only way to salvation was widely done in Great Britain for centuries. (Prohibiting it sounds unjustified to me — let the listeners make up their own minds about what to believe.) Whether in this instance civil disturbance laws are being used legally in forbidding it is doubtful. (In my opinion doing so rewards persons who threaten violence to silence opposing points of view.) I don’t know which laws and rights pertain to private worship and which to public preaching, but rejecting public expression of that traditional Christian view represents a major departure from English tradition.
> Only a couple of British legislators said anything about it [the right to bear arms], and they were ignored.
As you point out, sometimes it’s just a matter of governments ignoring rights previously guaranteed. Rights can be exercised only to the degree that people are willing to defend them (and, in the final analysis — if necessary — with force).