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I leave for Scotland today, in an hour. I realized while packing that I am bringing a large steel cannister, which could quite easily be mistaken for a missile casing to an over-zealous luggage x-ray attendant. I make a note to mention the contents of my case while checking in, at the same time as requesting a vegetarian meal and asking for the emergency exit seat (I like the extra foot room). I decided against the latter, not wanting to double suspicion.