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I got this one off @fussballclub which I've then modified to make it a bit shorter
https://ridewithgps.com/routes/22839241
(mostly I cut out a detour to Frinton on Sea).
As a result I can't guarantee it as being totally reliable as I don't know what the roads I modified it to are like, though they looked small enough to be ok.
Also it's currently going in the reverse direction, which is less of a problem if using a wahoo gps, but will be annoying on garmin.
Going to see how adventurous I'm feeling in the morning - it is possible I'll be lazy and just ride back on the route out.
Does anyone have a gps route for Dunwich Dynamo and back again? I'm sure I've seen one that came back a slightly different route via the Blue Egg cafe, but can't find it now.