The two latest books are perhaps not entirely my cup of tea, but then I don't think I'm really the target market!
I am, however, absolutely in awe of the technique employed in both Spitfire and Lancaster, and offer my unqualified congratulations on a really professional job. Spitfire is a really skilfully written book and shows JN to be a really gifted story-teller - I'm not that far into Lanc yet, but I daresay I will enjoy it!
I wish my old Dad was still with us - he flew Yorks after the War, and logged a lot of time in the Lanc and Lincoln at the RAE after that, and had a real soft spot for the Lanc. His log books include all of the big four 4-engined bombers - Lanc, Halifax, B-17 and B-24, and he never flew a normal, standard bomber sortie in any of them. I'd be fascinated in what he would have made of the latest book.
Good luck with Tornado, JN!