I always understood the ‘widowmaker’ as being a bit of a tounge in cheek name for it. Its just doubletrack with lots of 10-30cm rocks, some fixed and a few loose, seemingly easier the faster you go but with a higher ‘failure penalty’, as in if you lost your front wheel you would be more than likely to land on something hard and pointy. Gives your bingo wings a bit of a shaking on the way down, and a moderately satisfying climb if you do it the ‘wrong’ way.
Loads of semi-cheeky round there too. Lights and someone to show you round when all the walkers have gone home would be ace. Yogi cycling do a not-too-strenuous group night ride on a thursday usually meeting at the car park in Yelverton. Never done the thursdsay rides, a few different faces from the ones I know but apparently they are a nice bunch.