Dropping someone off at a UK airport usually costs around £6.51 on average, but...

https://caidenaope074.trexgame.net/should-i-ever-idle-at-the-kerb-at-gatwick-for-10

Dropping someone off at a UK airport usually costs around £6.51 on average, but it’s £10 at Gatwick and £7 at Heathrow. We'll break down how these fees compare to parking costs, plus what pick-up charges look like