I know what you mean about a "rod for his own back". Many years ago Ian Skennerton published the difinitive work on the Lee Enfield series of rifles "The British Service Lee". It too was a landmark publication, and I think it was intended as the last word on the subject. The book is now on it's third version as more information has come to light and previous mistakes or good faith errors have been rectified.
I suppose it's easy for me to sit here in my chair and say, "well so and so's wrong", or "that's not what that picture shows", but it's not me that's put the work into it and spent the frustrating hours on research.
Like I said, "mixed feelings", but I certainly won't slag the book off.
Thanks to the book I've been able to identify when my MkIII was completed and have found that it's serial number is one of the ones that's got a duplicate out there somewhere. So, has anyone else got a Webley MkIII with the serial number A2505?
The South of England has 2 good things, the M1 and the A1. Both will take you to Yorkshire.