Hmmm...
I came here today with the intent of sharing my hypothesis about why would a prince have his guns made in a dramatically different gauge, but since the hypothesis has nothing to do with royal sex life, I don't think anyone will be interested...
I don't give a good rattlin' damn about the sex life (if any) of the royal families- But the 14 gauge hypohesis intrigues me- so please go further with that research. I know as much about driven bird shooting protocols in Limey_land or Europe as I do quantum physics, but I am "spitballing here" if you have the wherewithall to afford the fancy togs and the matched pair of London Best Guns, surely you can afford to bring extra shells "just in case" in the standard gauge used there- the great 12 bore--and if in the flurry and scurry of driven grouse, dropping a 14 bore shell in a 12 bore chamber by mistake, then adding ta 12 bore shell (assuming the chamber was empty) could lead to a real disaster-