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Trime, by the time I've taken them for something to eat, I should hope we haven't got too long to wait in the departure lounge... so it shouldn't be too much hassle to pull them around for a bit, and keep them from getting bored. If anything, I would be doing it to save other people's annoyance, when my child gets fed up of waiting and starts throwing a tantrum! But yeah, not ideal.
Woofgang, they seem to be really popular, lots of people have said they have them.
Redcrx, oh wow! I didn't know they did a Grufallo one. I may get that for myself :)
Thank-you to all, and thank-you for the link also :)