16/45, because I couldn't get a 46. It's a little too tall, but not bad. At least it's an easy swap to a 14t. I tried 16/43 once before, and thought it a complete waste of time.
The taller gearing might be okay with clubman bars, or even a Triumph Euro bend, but the aerodynamic profile of this bike is all wrong for tall gearing.
For deMille, young fur-henchmen can't be rowing.