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

https://highstylife.com/how-do-i-compare-taxi-both-ways-vs-parking-without-guessing/

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