Safety concern
On three of my last four A319 flights with BA I noted that the video screens remained in their extended position once during landing; once during take-off and once both for take-off and landing. Is there a specific company policy regarding this? Only it occured to me that, in the event of a rapid emergency evacuation, passengers sitting in the middle seat directly under the screens could cause themselves potentially serious head injuries in their haste to get up and go. Just an observation which I'd like to share with you in the interest of safety.