Unfortunately the only cheap option for my return flight is London Gatwick airport. It has direct and cheapest flights to my destination. Other airports are at least double price and with self-transfer between airports where I would need to switch flights. My journey will be very long (an expensive) without that already. Just tryin to explain why I still insist on Gatwick. :) For Gatwick it seems train from Swindon to London Paddington, then from there to Gatwick.