We are off to Australia in a couple of weeks with a 1 y.o. and a 3 y.o. (God help us!). Just wondering what to do with them in the 2-3 hours between check-in and boarding. Has anyone used any of the play areas in terminals 4 or 5 like the KLM Holideck (costs £50 - worth it?)? Any advice on how to occupy them before they drive us and everyone else mad - and this is even before we embark on our 23 hour plane journey!!!