TCN done. Twats. Thank you for letting us know.
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I know a bit about what you're up against. You're a hero, girl. As a sometime A&E veteran (not serious), not to mention too tight to pay a quid for a small packet of hula hoops, I keep M&S biscuits and kettle chips, diet cokes etc, in the hall in one of those cloth book bags. I pinch magazines when I'm there.
Obviously it doesn't last long wherever I and my frail appetite happen to be
but I do refill it so there's always something to take the edge off hours under strip lighting on those awful plastic chairs. The key is to get really nice stuff, you need the best possible deliciousness.