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The ruling Conservative party split over referendum on EU membership. British Prime Minister David Cameron has renegotiated an EU deal which he's presented to Parliament. He's trying to convince MPs of the importance of the UK staying within the EU. It comes a day after Boris Johnson joined the 'Leave' campaign. The Mayor of London said the June referendum was a "once in a lifetime opportunity for real change". The ÃÛÑ¿´«Ã½ World Service's UK Political Correspondent, Rob Watson, ponders what it all means.

( Main Image: File photo from October 2015 of Mayor of London, Boris Johnson. Credit:Stefan Rousseau/PA Wire)