The Uckfield line runs through Greater London > Surrey > Kent > East Sussex. Hertfordshire must get the diesels out of King's Cross?
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No it's not!
No, you're right, it's not.
Is Gatwick Airport actually in West Sussex? Postally it's RH6 which is Horley and therefore Surrey. Postal boundaries don't always line up with county boundaries TBF, but if Gatwick is in WS, it's not by much.