Much better to do your PPL for SE Land (a Cessna or Piper) then do a test in a motor glider. The glider is different to fly than a normal aircraft and I really believe that it's easier to start from scratch and stay with the same aircraft type from scratch through to PPL and then try diffent types of aircraft including motor gliders. The PPL SE Land covers motor gliders as well although you will need a check out on a motor glider by a CAA examiner who will stamp your log book to the effect that he thinks you are competent to fly one. Glider air brakes sure are different to flaps!