My DS and friends want to do a little overnight trip together after GCSEs. He’s really responsible and I’m not at all concerned about them doing something small scale in the UK. However, DS and one of his friends will only be 15 (the other 2 will be 16). Is there anything they can do without grown up supervision? The back up plan would be camping or maybe even self catering but with an adult discreetly on hand but I just wondered what others have done at a similar time.