Pro-velo Support are holding a series of cycling and running events which include a 12 hour off-road running event in the Malvern Hills.
And the Thunder Run 24 hour event which can be run by teams as well as soloists.
There are also MTB events such as Enduro 6 and Mountain Mayhem. We usually enter a couple of teams from the mountain bike section in Lyme RC and they all say they are great events to do.
The links to the site is: http://www.provelosupportuk.com/