The lastest information about this coach service (on 1 Nov 2019) came from the Traveline South East website. The timetable for this service appears to have started on 19 Apr 2019 and is scheduled to finish on 15 Nov 2020. This is a National Express coach service which should be booked in advance of travel. The 'Online Map' link above also contains links to a Google Earth view of this service.
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