Hi Stephen, deepest apologies for the very slow reply. I was away from home for a few weeks and only now had a chance to dismantle the Clabrough.
It does indeed have cocking lever pivot pins and when I removed those the levers can be moved about half an inch to the rear. Unfortunately, that did not have any effect on the fore-end lever, which still won't move far enough to release. Of course, one can't get to the screws holding the fore-end iron to the lever assembly. I have read about splitting the fore-end wood in a case like this but very much hope there is something less drastic to try next.
