An English physician, Dr Frobridge, who was visiting the small Czech spa town of Karlovy Vary as the personal physician to Count Zu Pletenberg-Mietingen...
So did it with no alterations to proportions (Degroff recipe) and I'm inclined to say my initial suspicion that the spice would bully the other ingredients was right. Still a decent drink but would probably be better if the Becherovka was touched down to 5ml or so.
Many thanks, I'll have a dabble in due course and might start with a teaspoonful or two and see how it goes. I indulged in a stout with a separate shot of Becherovka over the weekend for a bit of Prague nostalgia to reacquaint myself with the stuff.