It is like the inner circle of hell. Heathrow Airport at the beginning of the summer holidays. Made worse by the presence of children. Everywhere. Crying, fighting over luggage trolleys, kicking you in the back of the leg, demanding food, refusing food, and letting us all know how bored they are. You are worried about important, adult things such as duty free booze. They are worried about silly things such as Lego watches. On the plane, things are no better, since you can add travel sickness into the mix.