LGW - MCO flight VS27 - PE

I'm travelling PE to MCO, can anyone tell me why the VS27 at the end of February has a 747 400 config 4 shown on the seating plan - I've only ever travelled on a config 2 or 3.
If not in UC, I prefer to do PE in the bubble but obviously config 4 is only UC. Will the aircraft be changed?
Any advise please??? Thanks
If not in UC, I prefer to do PE in the bubble but obviously config 4 is only UC. Will the aircraft be changed?
Any advise please??? Thanks
