Sometimes I don't know what they are thinking in the tower. This year I saw it many times that outgoing aircrafts are blocking incoming and therefore the incoming are blocking the outgoing. A classic deadlock. They should plan a head where to wait until a stand is free. Once our aircraft waited 45 min to get a free gate at T5. That's one of the reason why I add an additional 30 to 60 min in connecting flights at LHR.

And the peak is this runway swapping at 3pm. I don't know why they are doing this. However, this results that many flights have to wait until 3pm before they can hit the runway. At the and some flights are then 30 to 60 min delayed because of this.