I can't speak for other schools but check out the Central Coast Aero Club at Warnervale. Andrew Smith is the General Manager. Great crew, good aircraft, and highly experienced and professional instructors leading the team.
Your private pilot licence is 'perpetual'. As I understand it you won't need to do any subjects or exams again but you will need to do a flight review and have a current medical. It might take some time to get you up to standard for the review though...!