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

https://web-wiki.win/index.php/Stansted_Drop_Off_Fee_%C2%A310_%E2%80%93_Is_There_Any_Free_Option%3F

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