Thanks for your reply.
Based on the volume of previous correspondence and the length of time that we've been waiting for his solicitor to review and forward his latest 'detailed' objections, which we are assured are in the pipeline, I can only assume that our own solicitor is being extremely cautious. He wants to see the back of this just as much as we do. There are no large value issues, but the 'in-law' is known for his refusal to let go once he gets his teeth into something like this. The word 'obsessive' doesn't even come close.
Our solicitor has so far avoided any suggestion that we do actually have the right to close this matter, even under these extreme circumstances, but I'll wait and see what next week brings then consider our options.