Thanks to you all for such swift and well-informed responses, which I shall spend happy hours following up. Would love to have heard the 2 x Merlin, 2 x Nene Lancastrian, although I suppose they may not have used them all together. I was certain I could rely on Pprune, but to get so much in less than 8 hours is amazing!
Skydiver69 - your mention of Langar was a "madeleine moment" for me too. We used the pool there for dinghy drills whilst on my JP BFTS at Syerston.
ISTR there was a beacon (Rebecca? Eureka?) at Langar also....