Be consistent and use a single variety of English. Other things being equal, we recommend standard British English (e.g., centre, colour, defence, etc.). On occasion, however, texts written in British English will include references to programmes, organisations or other concepts that use a different system of spelling (US, Oxford, etc.). We recommend conserving these different spellings. Thus, the words program in White House Internship Program and organization in International Maritime Organization should not be changed to programme and organisation, respectively.