Dropping someone at a UK airport can cost £6.51 on average, with Gatwick...
https://high-wiki.win/index.php/Why_Can%E2%80%99t_You_Pay_the_Same_Drop-Off_Fee_Twice_at_Some_Big_UK_Airports%3F
Dropping someone at a UK airport can cost £6.51 on average, with Gatwick hitting around £10 and Heathrow about £7