Pennines

The challenge sees runners take on 268 miles of the Pennine Way, starting out at Edale in the Peak District, and ending in Kirk Yetholm, Scotland.

Trained volunteers will work as citizen scientists to sort, count and quantify plastic items at litter hotspots from the Pennines to Liverpool Bay.

Olly Rastrick, 15, could have bled to death on a Cumbrian fell without treatment from air ambulance experts.