Scalextric model G.P set

Hi all and thank you in advance. If I was trying to find what is included in a specific set, where would the best place to look? I have a New Zealand grand prix series box that came with a lot of extra track and I want to make the set up properly. Looking online, I can only seem to find what's in a G.P.3 or later box but nothing on if the model no. is just G.P. If anyone can steer me in the right direction that would be great. ☺