The Foxtail (Thomas Kunick via Gaz Regan) with Tanqueray London dry gin (substituted for Oxley gin), Benedictine, white grapefruit juice (Oro Blanco).
A very simple three components/equal parts number. Benedictine is indeed very nice with grapefruit.
I think the cocktail would be better with slightly more gin and less Benedictine because the balance was a tad off - the flavors were herbal and sometimes bordering on the side of medicinal. Or maybe Oxley gin works better with these ratios, it's entirely possible. Apparently it's also juniper-forward but has more citrus than Tanqueray.