Warmtoast, thanks for those, very illuminating. I don't recall reading those. I do remember that he had supposedly tried to buy the chief constable of Lincolnshire's house in Harmston IIRC. The pay of a flt lt would not match the sort of house a chief constable might have had.
The report of special branch aspects are interesting. I seem to remember that the Russian embassy was as likely as not to have informed on him too in case he was an agent provocateur. As ex-RAF his half-life was going to be extremely short. They would much have prefered to develop their own in-place agents such as Brittain and Praguer where they could be developed and controlled.