AMRITSAR, India, Feb 21 (Reuters) - British Prime Minister David Cameron has raised the possibility of diverting hundreds of millions of pounds from foreign aid to defence and security. Faced with anger in his ruling Conservative party about further possible defence cuts at a time when he says Britain must spend 0.7 percent of gross domestic product on foreign aid, Cameron told reporters he was interested in exploring ways to use money earmarked for foreign aid for wider security purposes.