Many thanks JDL. That's definitely the proof of the pudding. I might as well but 11 inch and avoid the hassle of having to return one that doesn't fit. They do make kits for the more "common" (😉
sports classics and seem genuinely interested in producing a P1800 kit in the future.
Just before I leave you all in peace, has anyone had any experience with Brookhouse's 5 blade viscous fan conversion?