If coming from the south, many coastal towns have direct trains to Gatwick

https://eduardordmy650.lucialpiazzale.com/gatwick-airport-drop-off-and-pick-up-rules-fees-and-locations-2

If coming from the south, many coastal towns have direct trains to Gatwick. Check Southern and Thameslink routes from places like Worthing, Lewes, and Eastbourne.