Will Mogae ever be called Sir?

Knighthood is a British honour established by King George V in 1917. The Most excellent Order of the British Empire (OBE) is an order of the chivalry, which includes five classes in civil and military divisions (Knight Grand Cross-GBE, Knight Commander-KBE, Commander-CBE, Officer-OBE and Member-MBE). According  to available information on the British honour system, only two highest ranks (GBE and KBE) entail admission into knighthood, an honour allowing the recipient to use the title 'Sir' for male or dame(females) before their names.

"British honours are thought by the public to be awarded on merit and on the basis of exceptional achievement or service. The Queen chooses the recipients on the advice of the Prime Minister and other relevant ministers. Honorary awards to foreigners are recommended by the Secretary of the State for Foreign and Commonwealth Affairs."