Heathrow appears not yet to have clarified the previous ambiguity as to whether the charge is for actually dropping off a passenger, or simply for entering the drop-off zone.
On one hand, it states "There is a £5
charge for vehicles entering the drop-off areas" (my emphasis); on the other hand (and on the same page) it says "
Pay for a single drop-off or pre-pay for multiple drop-offs"
Terminal Drop-Off Charge