(And quoting all other posts concerning this in this thread)

Once, he arrived from BEY and I went to pick him up. Usual questions asked, where are you coming from, who is picking you up, did you ever travel alone before, do you know how to go on from here... But they had to call me up to make sure I was at the airport, and then they had to escort him down to baggage reclaim, through customs where they x-rayed his bags and then the official checked my driving licence.

His friend has a notarised letter though, just to be on the safe side. I know he doesn't need a visa / whatever but I was wondering if my son and his friend would be even more "harassed" if coming in together, both being 15.