I think the production team are keeping things pretty organic and seeing what works and what doesn't.

The episodes are like Chalk and Cheese sometimes with some focusing purely on cars and others, like you say, just mucking about.

I don't think it helped that we went 5 weeks with no TG and then got a pretty lack lustre episode.

Funny reading some the reactions on forums though, some people complaining how dangerous they were acting on the campsite, some saying how they are going to go out and make a proper car show and my favourite being a guy saying how Stig could have done a better job of driving the Vectra