unusual hallmark

I am trying to find out if an item that I have has any value and I am hoping someone can help. I have a presentation leather conference folder (one of only 30 ) commissioned to present to each of the G8 leaders,and made by a small workshop in Scotland, for the Gleneagles G8 summit in Scotland. It has two silver corners both with Scottish Hallmarks and the makers mark as well as a special G8 one made especially for the summit. Is this likely to be worth anything?
Appreciate any thoughts