Although I fly reasonably often I have never bought anything other than a couple of bottles or perfume at an airport. I'm flying through heathrow shortly and was considering buying a quite a bulky camera and also a netbook or a laptop. these will come in big boxes and won't fit in a flight bag. Can you carry these onto a plane in addition to what you already have? I can't recall anyone getting on with a load of stuff at UK airports apart from people with a couple of bottles.