Employers are responsible for ensuring the work on any forestry or arboriculture site does not affect the health and safety of other people. They need to understand how the regulations apply for each activity and how to assess and control the risks.
Forestry Industry Safety Accord (FISA) have produced Guidance on Managing Health and Safety in Forestry (2019) which is available on the (FISA) website.
First aid at work: Your questions answered
basic advice on first aid at work
Aerial tree rescue
Under forestry operations