Dropping someone off at UK airports can vary quite a bit—Gatwick charges around...

https://www.lima-bookmarkings.win/heading-to-the-airport-soon-dropping-off-can-cost-you-an-average-of-6-51-but

Dropping someone off at UK airports can vary quite a bit—Gatwick charges around £10, while Heathrow’s about £7. On average, it’s £6.51 for a quick stop