Bogeymann,
I don't think that any of the BMAA (microlight) aircraft can be used for hours that can be logged on your UK PPL(A) - that's why a PFA permit aircraft is of more interest to me.
I went down to the Microlight fare at Popham over the 4th/ 5th May and what I find strange is that the same aircraft can be built as a microlight or a group A. However, the microlight version will typically have a 3 blade prop, possibly be faster and have simpler ignition requirements.
I'm looking at buying a completed or repairable PFA type aircraft that I can use for hour building. I'll be going to Kemble as well!