For a sgian dubh
You might want to check out Rab Gordon, he is a member here and I have never heard a bad thing about his work, below is his website:

http://www.rainnea.com/sgian-dubhs.htm

Also I have been thinking about it have you thought about Geoffrey Tailors for everything else you need, here is the website for them:


http://www.geoffreykilts.co.uk/gt_welcome.htm


Good luck with it, don't be in a rush and I am sure you will be happy with your choice.