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In the three years since the birth of the so-called Islamic State, it's believed up to 850 men, women, boys and girls have left the UK to join group. But some of those confronting the Islamic State group on the battlefield are also from the UK. James O'Brien speaks to Vasilika Scurfield, the mother of Erik Scurfield who was killed in 2015 as he fought with the Kurdish YPG army.