See Shropshire Fell Running facebook group - https://www.facebook.com/events/731045910376701/
10:00–23:59
Nr. Womerton Farm, All Stretton, SY6 6LJ GR: 458 971
The course is a 21km loop run clockwise, then anticlockwise (into darkness if you're not superquick), then a shorter clockwise version to make up 50km. Or you can just do one or two loops for a half or full marathon distance. Only one catch - it's not exactly all cushty going, and it's a bit steep in places. 5,000m of ascent roughly if you do the whole 50km. If you want an idea of how brutal it might be, have a look at some of the stuff online about the Barkley Marathons. Entries open at Easter.