Improvements as suggested, thanks (but I left the cloud alone):
Click image for larger version.  Name: Pendon Stack 1b.jpg  Views: 72  Size: 262.1 KB  ID: 132619

Yes, Acorn, I visited Pendon on Saturday for the first time. It's a wonderful, inspirational place if you're a GWR railway modeller.

I took some focus stacks using my SmartPhone and merged them using (ahem) Affinity Photo to give greater depth of field. Camelot / Designer Pro sadly doesn't have that ability yet.

I have a few more stacks to process.