6 hour timed challenge where you can run as many 3.28 mile laps as you choose. 4 laps for a half marathon, 8 laps for a marathon, 9+ for an ultra or 1 or more to be a finisher and receive your medal and and a stack of chocolate.

The event is being held at Rickmansworth Aquadrome (3 miles from M25 junction 18). The flat scenic route is on tarmaced paths that take you alongside the River Colne and around the three lakes at the Aquadrome.

The race will have staggered starts from 08.30 with a cut off 6 hours after you start (you cannot start a lap after this time but you can complete a lap which you have started even if your finish time is a little over 6 hours).

Free parking, toilets and cafe near the start

There are no 'on the day entries'.