No, you cant keep your Single Engine Piston Rating current of a Microlight. But what rating you can keep one current is a Touring Motor Glider, although you have to do another skills test, motor gliding is very cheap, and when the engine is off, "Its Free". Theres a very decent share for sale at Waterford at the moment, very affordable. If your interested send a pm.
When a flight is proceeding incredibly well, something was forgotten.