pouncer
Firstly there are some Western States that are very sensitive about filming on overflights, and it's not just places in the Middle East, even parts of Canada and the States used to be, and probably are, still "sensitive", so if the Cabin Crew say so don't film. On the other hand I have noticed that some cabin crew on some carriers have become very aggressive re- filming and it's not just BA - I saw one Easyjet Cabin Crew member crew being very aggressive with a passenger who was filming during the safety demo a week or two ago. The Cabin Crew memeber didn't want to be filmed - fair enough - but IMHO she should just have said she didn't want to be filmed, she shouldn't have dressed it up with "security and it's secret"....