"The Flying Monk 10 Mile is a two lap course that has something for everyone, with wooded trails,wide open vistas, boggy bits and plenty of mud - minimum age on race day 17. £12
Also "The Fearless 5 Mile Fun Run is a chance to take in all the thrills and spills of the 10 but over a shorter one lap distance. Minimum age 15 on race day. £ Affiliated, £8 Unaffiliated £10."
And also "The Children's Muddy Mile is around an open field, so family and friends can easily see them in action. Open to ages 8 to 14 (age as at 17 March 2013). £4 Affiliated or unaffiliated."