Earlier this year, Ruth Wilson travelled to a Rwandan refugee camp with Save the Children in what was to be an eye-opening, life-changing trip. Here, she relays her experience. "Shoot!" yells Karina, a tall, athletic 15-year-old Burundian as she launches a ball in my direction. I grab it, go for the basket and miss. To be fair, I haven't seen a court since my netball days at my covent school in Surrey and the competition is stiff. These girls can jump.