Ds is 15 and we are fairly lenient letting him go places but haven't allowed him to go to London yet.He wants to go to a skate park in shepherds bush and he has been there before as part of birthday trips but always with a parent in teh vicinity in case anything happens.My main concern is that one of them has an accident and no one is around they are all v competent skaters but no helmets and they do take risks which is fine with us at the end of the phone but not so good if we are hours away.One of his friends has his birthday this week and his mum has said he can go and he wants to take my ds plus 3 others.He is only 14 but his parents are v liberal etc and seem happy at teh thought of him being there on his own.I on the other hand have said no as I am concerned that if there is an accident they have no adult.What shall I do?