Well, it's taken a while, but The Final Flight is out. Thank you all for your valuable help. Any authenticity errors are entirely mine.
As a thank you to those above who helped, I can send a link to an electronic version of the book (can be loaded onto most devices). Drop me a PM with an email address.
Alternatively if you feel generous it's available in paperback at Amazon and (at the time of writing) available for pre-order on Kindle. Also available until next week more widely at Barnes & Noble, Kobo, Apple Books etc. (It goes exclusive to Amazon next week).
I hope it will be an enjoyable foray back to the 1960s Royal Air Force for you.
This link will take you to the Amazon page relevant for your country:
https://geni.us/thefinalflight
James.