Sir Archibald's name pops up in many wartime stories. Sunderland W4026 crashed into Eagle's Rock, Caithness, on 25/08/1942. All 15 on board had supposedly perished as matched with the SOB, including the King's youngest brother, Prince George the Duke of Kent, an RAF Air Commodore on the staff of the RAF Inspector General.
The crash site was close to the estate of Sir Archibald that bordered Loch More, the aircraft was off flight plan track (which should have kept it over the sea), and friends of the Duke were said to be in nearby Berriedale, on the coast. To cap it all the rear gunner survived the crash, found some miles from the crash site having walked from it, and kept shtum thereafter. There was talk of an extra passenger, large amounts of Swedish Kroner (worthless at the official destination of Iceland), and a 30 min discrepancy in the time of crash given the ATD (ie it was late at the scene of its crash). In short all the makings of a good conspiracy, ie the smuggling back to Germany via neutral Sweden of the Reich Deputy Fuhrer Rudolf Hess. The man who died at Spandau appeared to lack Hess's WWI under arm wounds and committed suicide with a horizontal ligature, a first in forensic science...
Here's an earlier PPRuNe thread that mentions an even earlier one:-
https://www.pprune.org/archive/index.php/t-526911.html