Ref the Anson photo. A quick check of the registration shows that it's a T21 specificly built as a Nav trainer in 1949. One would suspect that at that late stage, it would have been fitted with CS featherable props.
I've no idea why they are flying assymetric formation, or for that matter if it was my dad who took the photo. He was very keen on photography and had a good camera, even as an impoverished Navigator student in the 1950s, so it is possible that it's one of his. All the photos came from his photo album which I have scanned.