So, if you're a fully qualified JAR-FCL FI(A) and wish to instruct on something like a Eurostar, you need (in theory) 60 hrs as PIC of Microlights (see Lasors H7.1.b) before starting a course just to be an AFI. Then another 140 hours on Microlights, including 100 hours and 10 months of Microlight instruction before you can upgrade to FI (Microlight)?
Whereas if you're a fully qualified JAR-FCL FI(A) and wish to instruct on a single pilot ME aeroplane, apart (obviously) from holding the MEP Class Rating, you only need 30 hours PIC on the ME class / type before starting the course?
Those Microlights must be tricky little things......
Or maybe (more likely!), the BMAA have higher standards than the JAA / €ASA?