i think you were completely in the right matey.

while at his age yes, some kids are ready to be left alone, the thing is he was not in his own home, or his own environment, and he was under your care so its your choice. its not negative.... its responsible.

dont know anything about legal stuff, but i am only just recently leaving my kids home and thats just to run over next door to my mums place for 5 mins. my kids are 11 and 8. but next door for us is 2 kms away.