North Herts Road Runners Half Marathon - The Greenway Challenge takes in a 13.1 miles of the Garden City Greenway in a clockwise direction starting from Standalone Farm in Letchworth. The route is self-guided, you'll be given a map and instructions but you are responsible for getting yourself around the route. There will be marshals at road crossings but you are responsible for your own safety.
Loads of homemade cake and tea/coffee will be waiting for you at the finish!
Full details and entries online: http://www.nhrr.org.uk/greenway-challenge.html