From their style guide[0]: Acronyms Use the abbreviated form of a title without explanation only if there is no chance of any misunderstanding (eg UN, Nato, I

From their style guide[0]: Acronyms Use the abbreviated form of a title without explanation only if there is no chance of any misunderstanding (eg UN, Nato, IRA, BBC). Otherwise, spell it out in full at first reference, or introduce a label (eg the public sector union Unite). Where you would normally pronounce the abbreviation as a string of letters - an initialism - use all capitals with no full stops or spaces (eg FA, UNHCR, NUT). However, our style is to use lower case with an initial cap for acronyms where you would normally pronounce the set of letters as a word (eg Aids, Farc, Eta, Nafta, Nasa, Opec, Apec). [0] http://www.bbc.co.uk/academy/journalism/news-style-guide/article/art20131010112740749 http://www.bbc.co.uk/academy/journalism/news-style-guide/art...