Dropping someone off at a UK airport can cost you – the average fee is around...

https://city-wiki.win/index.php/Is_It_Worth_Asking_Family_for_a_Lift_if_They_Have_to_Drive_Twice%3F_Understanding_Airport_Drop-Off_Charges_and_Alternatives

Dropping someone off at a UK airport can cost you – the average fee is around £6.51, but at places like Gatwick, it can hit £10. Heathrow charges about £7