I'm here, Sir. Ah, my Robertson reference book is the 1971 edition, so only covers 1911-1971. It still lists EZ999 as a Mk 1A, though!
I shall now peruse "Bombing Colours" by Michael J F Bowyer, 1973 (First Edition) in detail. I see it already mentions [p 189] the Vengeances of 82, 84 and 110 Sqns. Of course, the application/changes to roundel colours/proportions were, I assume, often done under field conditions, so it would hardly be surprising if variations were encountered. The same could apply to overall paint colours - "Just get on and paint it green - there's a war on, you know!"
Other bookcase items may be dusted down over the next few days.