You're well into loonytown with these "different classes of citizenship". We have different professions, which have different requirements, different obligations and therefore different rights. It has nothing to do with citizenship, that's Alex Jones level of argumentation.
McHrozni
You are confusing an office/position with a citizen's rights - the two are not the same, which is why it is illegal for me to carry a pistol but not for a police officer.
Like I said we are going to have to agree to disagree, you want one lot of citizens in the UK to have additional rights to apparently stop very, very rare attacks, I and most of the UK (including those very people you want to give this additional right to) don't. Given our relative lack of gun crime I think you are on a hiding to nothing to get the UK to grant additional rights so a small subsection of the citizenship have a right to carry a pistol at all time.