BOAC
The simple point is that an interested party could formally ask under FOI what the code was earlier in the flight.
If it was 7760 then at the very least the inquiries would have been shown to have been flawed as it had been described as "meaningless" and had got to be that setting by an object hitting the equipment or the crew were attempting to change the setting.
The next question would then be what was the meaning of 7760 - a clear and definitive answer being required.
I do not see that this is unreasonable - surely such an omission in the inquiries would only strengthen the argument that the verdicts of negligence were wrongly arrived at?
Looking ahead, if they had been given an extra task on their flight that in any way complicated or compromised normal practice on that route, then at the very least the case for blaming the crew is again weakened.
And of course if there was the slightest possibility of any equipment they may have been using in any way being set incorrectly, moved, or otherwise made to malfunction in any way (inadvertently or deliberately) then again the case for blaming the crew would again be weakened. Thus, I think that interested parties should follow up this navigation aspect as soon as possible – it may achieve their goal of clearing the pilots’ names quicker than any other way – and it is do-able.