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"I don't think I'm going to let them scan my case when I take a flight to the UK (going for a year) later this year" You may not have the option. Unlike the situation in the US, you cannot insist on a hand search, i.e. you have no right to make this selection. In some countries, notably France and The Netherlands, it is usually completely impossible to avoid ANYTHING from being scanned. Professional photographers often take the train in France to avoid high speed film being scanned and ruined. England is a toss-up. Try asking nicely, don't try to insist, that definitely won't work!