At the AA arrivals lounge now. It was a 747-400. We were moved to the same aircraft type but I'm not sure if either of the planes had Y+ (I was in F).

To add even more suspense to the flight, the captain announced after landing that we had to stay in our seats as the police had to remove a few passengers! Around 10-15 fully geared police officers boarded and took away 2 pax (or was it 3?) - the crew refused to divulge any information. All pax were ordered to stay in their seats but all the F pax were crowding around to catch a glimpse of the action. There was no violence or any shouting though.

Some F pax got a bit annoyed with the delay on top of the delay - I was quite okay as I don't have much planned in London today.