I have recently completed my PPL with Leading Edge at Cumbernauld, can not fault them. Very good friendly set up where you are made to feel very welcome.
Your weight and height should not be a problem, im heavier and taller than you and still managed to do PPL in C152.
Best advice is take a trip out to the club and meet the ops staff, instructors, club members and other PPL students they will be more than happy to answer any questions.
Anything else you want to know just ask and I will try my best to help.