Dropping someone off at UK airports can add up—expect around £6.51 on average,...

https://codyssplendidjournal.cloudhinter.com/posts/heathrow-drop-off-charge-ps7-with-no-free-time-how-do-you-avoid-it

Dropping someone off at UK airports can add up—expect around £6.51 on average, with Gatwick charging £10 and Heathrow £7. But pick-up fees can be different, so it’s worth checking both