Cart before the horse?
No comment on the OP's post but;
I just watched four BA videos, over the last 11 days on two Aircraft types. (A&B).
Why is the bit about having the your hand baggage in the locker or under your seat, towards the end of the video? We were already taxiing by the time we saw that, and (correct me if I'm wrong) we aren't suppose to taxi if all pax's baggage hasn't been stowed.
Same with the seatbelt bit - we're already rolling, so isn't this a bit late?
Realise that the video (or non-video) demonstration could be done before pushback, but that isn't the norm these days. So why tell us afterwards what we should have done previously?
Also realise that it's probably not permitted by the CAA's version of 'elf and safety, but why not show that video at the gate? Sure beats that awful Sky-News stuff. And it would inform us of what we are supposed to do before we do it, not after.