Some friends and I are doing the Slum Survivor challenge - spending a few days the way a billion people spend their lives. For two nights and three days I'll be limiting my diet, facing challenges and sleeping in an informal settlement (made out of cardboard boxes) outside my local church. All this is to get an insight into the challenges those around the world face every day by living in poverty and to help raise money to help some of the poorest people in the world.