BoseX,
Where does it say you must have differences training and a sign off?
I know the rules if you want an NPPL (microlights) licence and you have a JAA licence - or indeed any other licence - but where is this about differences training being obligatory.
With the old PPL(A) it wasn't, and with the JAR/JAA thingy, I thought the problem is that ICAO and JAA can't agree what a microlight is, so they can't say their licence doesn't cover them.
Whereas with the NPPL, the UK CAA can and does (and specifies the different types too).
Very best
XA
ps. Not that I think you should jump into a flexwing without a try first!
Although, with the single seat deregulated models, all you need is a pilot's licence - so any need for conversion training there?
(it is possible to get a microlight licence without doing any dual training, as well!)