Dropping someone off at a UK airport can cost more than you think—average fees...

https://sofiassplendidop-ed.talesignal.com/posts/what-is-the-best-option-if-my-flight-lands-at-midnight

Dropping someone off at a UK airport can cost more than you think—average fees hit around £6.51, with Gatwick charging up to £10 and Heathrow about £7