Not a video of a game but a video about the Op Sealion Game Paddy Griffith ran in 1974 with various high ranking military personnel who were around at the time of the actual aborted Op.
30 mins well worth your time
https://www.youtube.com/watch?v=kenvVK3U7qc (https://www.youtube.com/watch?v=kenvVK3U7qc)
Thanks, an interesting find :)
Very well worth a watch, an incredible group of participants in the game