Based on the thread http://www.railforums.co.uk/showthread.php?t=64199&highlight=return+excess where it states that Oldfield Park to Cardiff is valid duobling back via Bath as Oldfield Park to Bath return is under 3 miles does this mean Horley to London is valid via Gatwick by the same logic and thus a Horley-London Terminals SDS for £10 would be valid via Gatwick as it is routed any permitted?!!!!