I don't want to get anyone's hopes up too much, but it is worth asking your opinions on whether this video features Michael walking past the camera at the beginning. I've watched it many times...it looks like the nose is too big to be him...but the light seems to make everyone's noses look a little big. It doesn't help that he contorts his face either...but it is worth posting I think. He also has distinctive 'folds' or creases in his skin coming down on either side from his nostrils to his mouth...you can see these clearly in the photo of him in Andrew Birkin's book when he is holding something between thumb and forefinger while sitting in a boat, at Eilean Shona I think.
I read an article on here that Michael attended a military camp for the Scottish brigade at Wimbledon, and left the camp to attend an examination at Oxford, drowning a few days later. It seems to be a well-timed search, some videos of that camp have recently been uploaded to Getty images.
Even if it is unlikely to be him, it is still fascinating that Michael would have seen those camps, perhaps spoken with some of the solders in the videos...here's the link...
https://www.gettyimages.co.nz/detail/video/soldiers-of-the-london-scottish-reserve-regiment-stock-video-footage/mr_00057893
It would be so wonderful if it was him! Eager to hear your opinions, and clarification as to whether the post I read on here was accurate.