Drank nearly half this cocktail before realizing it hadn't been posted here yet. This one's heyday seems to have come and gone with first and second Elizabeth. But if it's good enough for the queen it's good enough for me in the wee hours of a Friday after work.
Various gin to Dubonnet ratios are called for. I wanted something a bit sturdier, but as a pre-dinner drink 1oz. gin to 2 oz. Dubonnet may be preferred.
1.5 oz. London Dry Gin (Beefeater seems appropriate here, with all the royalty connections and all. Why not?)