Dropping someone off at UK airports can add up—expect around £6.51 on average,...

https://dlf-ne.org/what-is-the-free-long-stay-window-at-gatwick-airport/

Dropping someone off at UK airports can add up—expect around £6.51 on average, with Gatwick charging £10 and Heathrow £7. But pick-up fees can be different, so it’s worth checking both