For the Half-Mammothon https://osmaps.ordnancesurvey.co.uk/route/5525536/Halfmammothon-2021
For the Mammothon https://osmaps.ordnancesurvey.co.uk/route/4146550/Mammothon-2021
For the Sw80K https://osmaps.ordnancesurvey.co.uk/route/4146455/Sw80K-2021
You can use the interactive controls to zoom in and out and to move around the map, or click on a marker for more info. (interactive map help)