The Dorset Group has undertaken an Event Risk Asssessment for the Dorset 100. There is a separate and more detailed Route Risk Assessment. Both of these are living documents and reflect the risk at the time of writing.
The LDWA organises many challenge and local group walks, as well as listing many more organised by other organisations. Challenge events are normally between 20 and 100 miles and must generally be completed within a defined time limit. Group walks are normally led walks of around 20 miles. Click here to go to the LDWA website.