Dropping someone off at a UK airport can cost you more than you might...

https://gunnersmasterop-eds.inkharbory.com/posts/can-you-pick-up-at-gatwick-without-paying-short-stay-prices

Dropping someone off at a UK airport can cost you more than you might think—take Gatwick, where it’s around £10 just to stop briefly. Heathrow’s about £7, with average fees across airports around £6.51