Okay, maybe I wasn't clear enough on my original post, and this is now descending into the realm of "I only use this!" and "Nothing else will do for my Zed!". So, for absolute clarity:
Any fuel that conforms to BS 7800 is suitable for running in the 350Z.
In an emergency you may use fuel that conforms to BS EN228, but you must limit yourself to low revs (3k rpm and below) else you can damage your engine. This only applies to the DE engined cars, as the HR cars can adapt for the lower RON fuel.
Any fuel that meets BS 7800 can be used in the 350Z. That includes all BP, Shell, Tesco, Texaco, Gulf and whoever else I've missed super unleaded variants.