The coach started to move off. I felt frightened. All these weeks, looking forward to it, and now I did'nt want to go.

Please, Mum, let me go home. She was running alongside, waving her hanky and crying...He'd nagged his mother for weeks to let him go on the school exchange, swapping his home in the backstreets of a northern town for a posh house in London.

With a proper family. With a dad. But now it was all going wrong...