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This here contains loads of good singletrack. But it can be a bit of a pain to follow a breadcrumb trail in the woods (GPS drift because of tree cover, having to ride singletrack slow whilst looking out of turnings, etc, etc).
https://www.strava.com/activities/693042594
My advice would be to get a compass (or a compass on your garmin screen) and follow a rough north-easterly heading, taking trails that look good, until the forest runs out then turn around and head the other way.
Going to Epping tomorrow with a friend who's getting int to all this. anyone got a gpx for a nice route?