If you come out and ride that pig out here, I will come up and wrench for you. May take me awhile to find my american wrenches and sockets.......I hate that fractional shit!!!!
Nope, but I've heard of them. Haven't owned a BSA or maybe an MG. My dad's Lotus didn't seem to have them either, when I helped him wrench on his Europa.
Whitworth was pretty much phased out by the late '70s, so if the Europa was one of the last ones built it probably didn't have many Whitworth fasteners. I've never worked on a Lotus, so I can't say with any certainty one way or the other. Even mid-70s British bikes had a mixture of Whitworth/BS and SAE fasteners.