According the the Small Arms Survey for 2014 and in spite of its many errors and criticisms, the US is ranked #1 world-wide in small arms ownership. The UK/Wales is #88, tied with Bulgaria and Honduras and trailing Switzerland (#4), France (#12), Canada (#13), New Zealand (#22), Northern Ireland (#25), Australia (#42), Ireland (#70), and Iran (#79 and tied with Israel).

Let Britain beware! Your former colonies are coming to get you!

(Please note that this survey of small arms is an estimate, albeit a good one, and includes as small arms morters of less than 100mm, light machine guns, and submachine guns. I'm certain that Canadians possess many 81mm mortars in civilian hands, probably as many as in the US.)