Briticism

(n.) A word, phrase, or idiom peculiar to Great Britain; any manner of using a word or words that is peculiar to Great Britain.

Thesaurus Entries

Anglicism, Briticism, Frenchism, Gallicism, Hibernicism, Irishism, Latinism, Scotticism, Yankeeism, chauvinism, flag waving, jingoism, love of country, nationalism, nationality, overpatriotism, patriotics, patriotism, ultranationalism