This two-day course provides the skills required when acting as an escort craft, safety boat or coach boat for a fleet of dinghies, windsurfers or canoes, or for racing or training activities. It includes rescue techniques and elements of race management and mark laying. It is strongly recommended that a member of the rescue crew should hold a first aid certificate (or should have experience of first aid).

You must hold a valid Poweboat Level 2 Certificate and a good understanding of Sailing and other waterspots activities. 
https://www.rya.org.uk/training/courses/safety-boat-course-psbc