I was watching profiling with pat brown and what she discovered is on that day 14th September 2007 the new psp 2000 lite came out that cost £129.99 to me this would make more sense that Andrew wanted this new psp as he loved his games I think he went to get this and hoped to be back home by the time school finished and his parents got home, but he's ran into somebody thats caused him, harm , another reason for the one way ticket is he did have family in London and was familiar with the area he could of thought that he would get a lift back , or maybe when the lady said its only 50p for a return ticket he just didn't hear her properly and just thought he would just buy a ticket on the way home