Not to plug an old post but...
http://www.xmarksthescot.com/forum/k...light=cruising

What I was told by the head of Port Security was that the only thing the would be concerned about would be a dirk or sword. From experience they have steak knives longer than your average sgian dubh. You can carry it through with you (I did this because of the silver work on my dress sporran) and just let them know or you can pack it. They will go through x-ray and if there is a problem they will contact you.

Richard-