I'm desperate to get the paint work a bit shinier this weekend since I have some spare time, I've got a bottle of Turtle wax car polish, is this going to do any harm applying this whilst I sort out which is the best wax product for me and my car?

I got the green bottle (not coloured, for metalic cars), £10 from Halfords style

 

I can't see it doing any harm. When wax wizard turns up, the cleanse will strip off anything else on there.

To be honest, you're best off asking Mark, but my advice would be to use the TW in the meantime.