Dropping someone at a UK airport can cost £6.51 on average, with Gatwick...
https://www.bookmarking-online.win/heading-to-a-uk-airport-soon-we-ve-broken-down-the-costs-of-dropping-off
Dropping someone at a UK airport can cost £6.51 on average, with Gatwick hitting around £10 and Heathrow about £7