My revisions have hit and I had a long and productive conversation with my editor about the way forward.
A good editor's eye is crucial. She saw some things that mean the entire reading experience is going to be so much better. She also challenged me to think about how I done things and why.
It turns out the one scene that I thought was central to the novel wasn't and there is a BETTER way.
I shall now retire to my cave and work things out. (My daughter points out that I don't have cave per say, just a study. However she likes the idea of me having a cave as I would make a very good cave dweller.)
This is going to be a great book when I get done.