He has arranged a meet up ( I say that as he did not ask, he told me) with friends he met at a sport summer camp in their home town a few hours away by train. He wants to travel there with a couple of 16 year olds, spend a day at the other end with these friends and then train journey back. I'm not happy at all. I'd be worried sick and I don't know any of these people? He doesn't see the issue! Would you say yes? say no? I have nobody to run this by.