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

https://www.blaze-bookmarks.win/dropping-someone-at-the-airport-on-average-uk-airports-charge-about-6-51

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