I don't see him ordering it at the Cafe Royale but he may have drunk something similar in Reading Gaol.
He might have made something out of the following publicity shot though:
When in decades past the idyllic country home of Miss Rose Gribble became a local inn, legend has it that the inquisitive local ferrets frequented the pub's back door on a mission to sample its own reputed brew. In their honour it was named Fursty Ferret.

