When I went to the Gathering of the Clans in Edinburgh in '09 I had no problem with wearing my skian Dhu in the Scottish Parliament but my Dad had to hand in his small Swiss Army knife; when I offered up my SD to the Security Officer he was most insistent that I wore it as it was part of the Scottish outfit and as long as I didn't run amok with it then it was perfectly OK for me to keep it with me.