I presume you mean your SEP (Land) Class Rating?
If re-validating by experience, flight time in a Single Engine Piston (Land) aeroplane will be acceptable no matter whether the aeroplane has a Permit to Fly or a Certificate of Airworthiness.
Flight time in Microlight aircraft will not count towards SEP Class Rating re-validation under JAR-FCL, it has to be on a SEP aeroplane (or TMG if a TMG Rating is included on the licence).
There is no such thing as 'Group 'A' - and hasn't been for nearly 5 years.......