Jonny, I spent a long long time on that bonnet. It is a very rewarding panel on the Z4 though! I thought the Rag Top stuff worked really well, so easy to use and left great results. It was a toss up between that and the 303 stuff but I think the Rag Top gets my vote.
Thanks James, lucky for me I have the house available for such shots!
Martin - I used a Megs G220, arguably the best polisher for beginners.