Just last week, several British airports (Gatwick included) lifted some of the restrictions on what can be worn or taken on board departing flights. For example, nail scissors and nail files are now permitted in hand luggage. I imagine that kilt pins may be left in our kilts again, but I hae me doots aboot the Sgian Dubh - mine was confiscated at Aberdeen airport a few years before 9/11, since when I have always worn a faux one whether flying or not.