Im a bit on the fence on that one QC, without going over it again, I thought the outer door to the office was lockable, but not the actual under stair cupboard?
Ah. OK. We had a thread on this that I started and I think you weren't around at the time, so that point wasn't brought up. If you are correct, that would address the point and it would also help explain why a guilty Jeremy has to say he left the rifle and ammunition out.
However, if the office (den) was locked, how does Jeremy enter the den to leave the silencer in the gun cupboard? Did he have a key?
You could just as well argue that Jeremy did not have a key, so that is why he left everything out in the back hallway/scullery area, for Nevill to collect, per an informal understanding they had. Would Nevill allow Jeremy a key to his private office anyway, notwithstanding the location of the rifle?
Also, I recall witness statements from Robert Boutflour, Jnr. and Anthony Pargeter in which they recount entering the den with no mention of it being locked. Mr Pargeter's statement is particularly relevant because he did so on his own - if you'll recall, it was to retrieve his own rifle. Did June give him a key?