From Andrew Marr’s History of Modern Britain, here’s his version of the famous, if apocryphal, George Brown story:
Attending an official reception in Peru, very inebriated, he approaches a willowy figure in scarlet for a dance. Brown is repulsed and protests grandly that he is Her Britannic Majesty’s Secretary of State for Foreign and Commonwealth Affairs; why could he not have a nice dance? The reply comes:
“For three reasons, Mr Brown. First because you are disgustingly drunk, second because that music is not a dance but our national anthem, and third because I am the cardinal archbishop of Lima.”
For another celebrated reception story, see here.