DX Wombat and others should note that there is no weight limit for a JAR PPL or for the SEP rating included within the licence.
Occasionalflyer, did the thread already give you an answer to your question?
Because me, DX and 3 Point are all correct with regards to the weight limit, but to understand this requires a detailed explanation of the difference between a class and a type rating, and the occasional need to get differences training within a class rating. Something that's normally buried deep inside the Air Law books.
So far you can safely assume that on a PPL(A) you can fly anything listed in the classifieds at the back end of your favourite general aviation magazine, except helicopters. In some cases you might need additional training, but most of the aircraft you can legally fly without that. (Not that that is always wise, mind you.)