Recommendations for appointments to the Order of the British Empire were originally made on the nomination of the United Kingdom, the self-governing Dominions of the Empire (later Commonwealth) and the Viceroy of India. Nominations continue today from Commonwealth countries that participate in recommending British (Imperial) honours. Most Commonwealth countries ceased recommendations for appointments to the Order of the British Empire when they created their own honours.
The five classes of appointment to the Order are, in descending order of precedence:
The senior two ranks of Knight or Dame Grand Cross, and Knight or Dame Commander, entitle their members to use the title of Sir for men and Dame for women before their forename. Most members are citizens of the United Kingdom or the Commonwealth realms that use the Imperial system of honours and awards.
Honorary knighthoods are appointed to citizens of nations where the Queen is not head of state, and may permit use of post-nominal letters but not the title of Sir or Dame. Occasionally, honorary appointees are, incorrectly, referred to as Sir or Dame – Bob Geldof, for example. Honorary appointees who later become a citizen of a Commonwealth realm can convert their appointment from honorary to substantive, then enjoy all privileges of membership of the order, including use of the title of Sir and Dame for the senior two ranks of the Order. An example is Irish broadcaster Terry Wogan, who was appointed an honorary Knight Commander of the Order in 2005, and on successful application for British citizenship, held alongside his Irish citizenship, was made a substantive member and subsequently styled as Sir Terry Wogan.