Stewart, also consider Dunlop Sport Bluresponse in the asked size. Reasonable priced, very good in the wet and the predecessor is/was 911 ceritified by Porsche. Which means this tyre can manage the mechanical forces of a rear mount engine as well. I drive them on a 1973 911 with good success. And someone here on TM has them happily on his Roadster, may be it was JohnV6 but I‘m not sure.
Ok I’ll add them to the list
I’ve been told from a good source that the Toyo Proxes should come off my list