Thanks for the information and comments.
I do also have a fairly early FS knife, but I prefer this knife - it's very functional as a bush/survival knife.
The original type D's are actually becoming quite hard to find, I wouldn't say they are rare but they are now commanding prices of anything from £170 to £250. I think I paid something like £10 for this, I originally got it as a "bush" knife and used it as such - it's so solidly built you can take small trees down with it (if you have the odd half an hour to spare).
Mervyn - you asked about Sark. In the summer we have a population of around 650 to 700 with all the seasonal workers, in winter the population drops to about 350 to 400. There weren't many fortifications on Sark, there were mine fields everywhere. The only real remnants of the German occupation we have are the German barbed wire fence posts (we have a couple in our garden) and the odd tunnel here and there. Guernsey, Jersey and Alderney on the other hand have masses of German fortifications.