This event is being run on the F20/10 course.START (GR 358126) on A10, at southern end of lay-by approx. ½ mile south of Rush Green elevated RAB (junction of A10 and A414) at 6th. cats eye north of post marked 51/28 . Proceed south on A10 past exits for Harlow (A414) and Hoddesdon (A1170) to:- TURN (4.968 miles) by bearing left onto slip road (signposted Broxbourne, Wormley, Turnford A1170) to Turnford elevated RAB. Take 2nd. exit onto slip road to join A10 northbound. Continue north on A10 past exits for Hoddesdon (A1170) and Harlow (A414) to:- FINISH (GR 357126) on A10, at 1st. cats eye south of northern end of island in lay-by approx. ½ mile south of Rush Green elevated RAB.