Not much of a secret really. Their visits were mainly to talk about some crated Merlins they had. Then, of course, the large number of T28's they wanted to get sold.
DA was a hot contender for all the above, and that is where his Merlins came from - as well as from India. Where there are probably many many more. Buying 12 crated and unused, as he did, must have set him back a few mil too!
treaders
Yes he did originally make his money out of scrap. Mountains of it. That is where he got his self defence arrogance from I expect.
Wonder where the Merlins are? No shortage of buyers after he died I dare say.