" The Civil GCA controllers were prohibited at the time from giving vertical guidance to aircraft after they had passed through 500 ft AGL."
And nobody knew that! Amazing.
Brookes also mentions the BOI. Because of the C-in-C the board became rather senior. (As no junior officer could pass judgement).
The "second navigator" bit. Someone must have anticipated the question: "Why was he (as qualified pilot) not in the right seat?"