Made a flight from EU to UK. Wife's nail file was shorter than the allowed length, judged quickly by the short side of a credit card or security bod's ID card. On return out of MAN no such luck. Too long and it was metal. It did not have a cutting edge, it had a point, so the length was of no relevance. It was less than the side of the ID card, but it was metal. Duh! I had asked, on EU departure, what the rules were for swiss penknife blades. Same answer, the short side of a credit card; and that has a razor sharp edge. I didn't have one, but the lady at MAN would have gone apoplectic at that considering what her response was to a nail file. UK has been in Brexit mode for years. They are so out of step in common sense airport security as to make me always take the ferries when possible.