Hi all.
Cheers John for your observations. Having read the book over the wèekend (doesn't take long as there aren't many words). I found it useful.
There are references to a volume two, which mentioned looking at rust in greater depth.
To conclude then with John's suggestion, we will indeed have a pile of real rust, which smells lovely

by the time Vol 2 is released.
Cheers
Charles
PS I am happy to have my book and look forward vol 2, as and when.
Chieftain No.34, functional. PKW IV (2002), operational. Panther G No.18 (2022), started, well some of it is. Series 1 4x4 No.28 and a Bailey Bridge.