Amazing! And all this silliness from the land that gave us the skean dhu.
A Skean Dhu (an actual fighting knife weapon or would that have been fighting knife tool) would not have required registration for purchase. It is a fixed blade knife!
The Dealer explained that any locking folding blade of any size whether it was a Buck Metro 1 inch blade or not, required the customers details to be recorded, i.e. Name and Address, as part of his legal compliance.
In areas with "zero tolerance" weapons policies, or heightened security concerns, the wearing of the sgian-dubh as part of traditional Scottish dress has sometimes created controversy. One such incident was the banning of sgian-dubhs from a school dance in Scotland.[5]
As with many other knives and cutting tools, air travellers have to put their sgian-dubh in checked baggage.
In Scotland, it is legal under the Criminal Law (Consolidation) (Scotland) Act 1995 Sec. 49, Sub-sec. 5(c) to wear a sgian-dubh, or other weapon, as part of any national costume.[6]
In England and Wales, it is legal under the Criminal Justice Act 1988 (section 139)[7] and the Offensive Weapons Act 1996 (section 4)[8] for someone wearing the national costume of Scotland to carry a sgian-dubh - see knife legislation.
So as long as your 'tooled up' for a knife weapons, er I mean tool fight in fancy dress then open carry of the sgian-dubh is perfectly legal.