Actually, as it happens, I passed my fats. 138/134 pilot/observer.
The memory test is more straightforward than I thought - it's more of a question of remembering how many numbers there are of a certain type, rather than trying to remember a whole sequence.
The spitfire one did actually turn out to be complete guesswork. I have literally no idea how I passed it. Maybe I subconsciously knew what went on, but I doubt it.
I suppose if anyone's going to sit the tests soon they can contact me if they have any questions from a candidate point of view