Re: Apparently he was allowed to continue his journey
"In the UK, the cops don't carry guns"
Yes they do. It's just that it is restricted to specialist highly trained officers - so they don't all carry guns. And they also tend to use standard issue NATO weapons and not cowboy pistols like the yanks.
"but airport security sure does."
No they don't in the UK. The only guys normally with guns at the airport are the Police.
Who look something like this: