Entry is open for the Harvest Trail half and quarter marathons.

Organised by Royston Runners, the off-road running event that starts and finishes on Therfield Heath, is taking place on Sunday, September 21.

A spokesperson said: “Whether you are an experienced trail runner or just a rookie, this is the run for you. It is 98 per cent off-road through the beautiful undulating Hertfordshire countryside.

“We run this event to give all trail runners an affordable day. There are no frills like t-shirts or prizes but we do offer refreshments at the finish and a certificate of completion. Give it a try, you won’t regret it.”

There will also be full catering facilities, including bar, showers and changing in the clubhouse.

To enter the race, visit www.roystonrunners.co.uk or www.runnersworld.co.uk