Quite by chance I spotted promotional posters for this while driving through Princes Risborough yesterday. Full details can be found here, but it looks like it could be an interesting day out. Incidentally, it was a minor accident at this event in 1925 that resulted in all motorsport on public roads being banned in England so it has some pretty major historic motorsport significance too, even if for the "wrong" reason. Quite by chance it coincides with my father coming to visit to celebrate his 80th birthday, and as a fully paid up petrol-head I thought it would make a pleasant few hours of entertainment for him. Anyone fancy meeting up?