Dropping someone off at UK airports can come with a surprise charge—on average...

https://www.phone-bookmarks.win/dropping-someone-at-a-uk-airport-can-cost-around-6-51-on-average-but-at

Dropping someone off at UK airports can come with a surprise charge—on average about £6.51. Heathrow’s fee is around £7, while Gatwick hits closer to £10