I dont think theres a lot the police would do, he's only a few hours late. Phoen round everyone he knows/spends time with, phone him, go and look for him. Where you hoping he's be hiding on tsr or something?
Thanks for the responses (the ones who took this thread seriously). I should have probably mentioned that he's a 13 year old without a mobile phone (my mother doesn't want to give him one). Anyway he just arrived. He had a basketball game ouside london.