Thanks, Papaw - interesting article, which successfully distracted me from doing actual work for a few minutes.
I was intrigued to learn that the WWII Rolls-Royce Merlin aircraft engines used S.U. carbs - I wonder if these were similar to the S.U. carbs found on British cars for so many years? Given the deserved reputation of the S.U. carb for fussiness, those pilots must have been really grateful for good mechanics!