Originally Posted by
FlyingScientist
BA's new Luck Balancing Tool™ (LBT) moves passengers that were given the best seats straightforwardly to the worst seats on equipment changes. It also ensures that all passengers with a window seat are given middle or aisle seats.

Yeah, I guessed as much!
I usually get a solid 5 hours sleep on that flights, which is enough to get me through the day ....... Not this time! 45 mins at best!