I got rather unlucky with this knife I'm afraid. GEC's UK dealer had the red-bone version, which when it arrived was an absolute beauty, except for the fact that I was unable to open the main blade without first opening the pen. It wasn't that the pull sat low, it was completely covered by the pen blade, the kick on the main blade clearly having been overground.
Since Charlie was online, I dropped him a PM for advice, and he was extremely helpful (and his knowledge quite fascinating). His educated hypothesis was that a loose filing or 'crumb' had fooled the cutler into grinding a bit too much off the kick, then when the 'crumb' was blown out the blade sank too low (as you can see on the third and fourth pic, the blade sits low in the frame). It seems that this knife was a one-off.
With the nail-nick of the pen close to the frame, I didn't think enough could be ground off the kick of this blade to expose the pull on the main blade. I very reluctantly returned it to the UK dealer, who agreed about the kick. Unfortunately though, there's no chance of a replacement, for the moment at least, so I've had to exchange it for another knife.
Just thought you folks might like to see the pics. Many thanks again for your help and advice Charlie :thumbup: