T5 is busy with BA lines appearing to move very slowly. Long line for First Wing all the way to the terminal door, but if you just need to get through security it’s a 3min wait for the scanner. Here in GF it’s not much busier than usual for a weekday, but I guess Sunday mornings might usually be a bit quieter?
People at the terminal doors stopping anyone without a flight within a suitable time (and that time is at least 4 hours out).