In case anyone cares, the answer to my question about the two flight-plans in post #283 can be found in the Privvy Council Ruling on Pg 22 onwards.
(I still have not got access to Chippendale's actual report or Mahon's Royal Commission document, nor have I fully digested the Court of Appeal document, so I'm playing catch-up here and, no doubt, the answer is in these documents too...)