Twenty-seven people heading for England have drowned near Calais after their boat sank. Three children and a pregnant woman are reported to be among those killed. It's the worst disaster on record involving migrants in the Channel. Now the political blame game is intensifying between France and the UK. Both have agreed to “do everything possible to stop the gangs responsible” but is this enough or is it time to rethink our migration policy? We speak to Dr Peter William Walsh from the Migration Observatory at the University of Oxford.
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