Did the child steal a boarding pass in the terminal ? With that you can get onto the aircraft on a European flight. Look around the terminal restaurant, you will usually find people who have put their BPs down on the table. Or did he steal it out of someones back pocket ?

bealine and others will tell us how many passports are stolen within the terminal each day.

What hacks me off more, though, is how BAA security can say with certainty that he went through security properly. Given that every other precaution fell apart, how do they know ?