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As coalition troops march on Mosul, we hear from the frontline, and discuss the military, political and humanitarian challenge posed by the operation. Also as former UKIP leadership candidate Steven Wolfe announces he's quitting the party, a fellow MEP concedes the party faces challenging times. And 800 years after Crusaders wiped out the Cathars for being heretics, the Catholic church apologises. Picture: Islamic State fighters in Mosul Credit: Associated Press.