I think that Xrayalpha's interpretation was the one originally intended
If I recall correctly, the requirement for microlight differences training for SEP holders was introduced as a result of an AAIB recommendation following a number of accidents.
The requirement to complete differences training for transferring control types for people who hold the privileges to act as PIC on microlights was also introduced as a result of an accident and resulting AAIB recommendation.
ifitaint...