Thanks IfItAint - I followed through all your references, and eventually checked with a microlight examiner to make sure.
The old PPL(D) and PPL(M) holders have grandfather rights to use 5/13 and permission to use the new system if they wish. NPPL(M) holders are on 24/12/1 same as PPL(SSEA) with the exception of a loophole that allows them to skip the 1 hour with an instructor but at then limited to no-passengers.
And I thought that I understood the microlight world! The little aeroplane world is nothing if not changeable.
G