Thanks, MJ. However, what you've been told there isn't 100% correct. This bit is correct:
The holder of either a Part-FCL PPL(A) or JAR-FCL PPL(A) or UK national PPL(A) with a valid SEP or TMG Class Ratings and appropriate validating Medical Certificate or Part-FCL LAPL(A) within the recency period for the endorsements with appropriate validating Medical Certificate ... who wishes to fly a microlight aircraft is required to seek appropriate differences training with a qualified Instructor before undertaking a flight as commander in a microlight aircraft irrespective of the control system in the aircraft. The training should be entered into the pilots logbook as pilot under training
This bit isn't:
or NPPL(A) with a valid SSEA or SLMG Class Rating and valid Declaration of Health who wishes to fly a microlight aircraft is required to seek appropriate differences training
A NPPL holder with a SSEA class rating or SLMG class rating would have to obtain a Microlight class rating via the cross-crediting documented in CAP 804 Section 5, Part A or on the NPPL website - differences training for NPPL SSEA/SLMG holders to fly microlights is not an available option.
ifitaint...