Gloucestershire based event biz Mean and Dirty events are running this cool event on Sunday August 25th 2013. Start and finish at Brockworth Rugby Club, near Gloucester. (details on the website)
http://madevents.wordpress.com/events-2/mad69er-2/The course will be a mixture of fast descents, short climbs, great singletrack and at the last count 3 river crossings. There's a free snack and a chance to top up on fluids at halfway.
The event is covered by radio marshals plus motorised backup.