Thanks people. I'll check it out.

I got Carrara 7 from Digital Arts but on their download site for it they also had another Carrara file titled something like 'Carrara Environmental' and it was a 180 meg file. When I installed it, it mentioned 'Pro' - so I don't know what I actually have, but looking around, what I have does quite a bit, including hair which I wouldn't expect to be in the standard version.