Genghis
CAA's rule (and not a popular one in some quarters) is however that if it can have a CofA it must - so you can't take a PA28 and put it on a permit.
Surely this is purely a revenue maintenance measure on the part of the CAA! Otherwise, every Private CofA spamcan would head for a P2F
Fly Stimulator
Is there a difference in the strength of a microlight versus e.g. your SR20/22? I realise one could build a composite <450kg plane which would be extremely strong - at a cost of perhaps £100k... but those I have seen all appear rather flimsy. Maybe it is deceptive. It would be relevant in turbulence.