By all accounts Jack Letts was a popular kid growing up. A class-clown who gained friends by cracking jokes and making them laugh.

But as a teenager, he developed Obsessive Compulsive Disorder and began struggling to find his place in the world.

"He had a phase being obsessed with football and would sleep next to his football,” his father, John, an organic farmer from Oxford, said. “The same thing happened with religion.”

It was at the age of 15 that Jack, who was raised in a secular household in Oxford, begun studying the Koran and made the decision to convert to Islam.

He started attending a local mosque and became preoccupied by the Arab Spring, in particular the Syrian civil war. He watched…

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