To anyone who has had their interest sparked by this thread, I have today communicated with Stephen Davis, who advises that there was a “powers that be” element to the scarcity of his book (!).
However, in a somewhat amazing coincidence, he advises that there is an update to the story in his latest book, just published in the UK, Australia & New Zealand (USA & Canada in May):
The following link from
Quist Solicitors in London, relating to the book and BA149 might also be of interest:
https://www.quistlaw.com/news-posts/...ry-continues1/