The Royal Horological Conservator — N/A
There are over 1,000 clocks, barometers, and thermometers at Windsor Castle and the other Royal residences. They’re not digital either, so someone has to wind them, repair them, and keep them working. Many of them are priceless, and are gifts royals have given to each other over the centuries, so there has probably been a royal horologist for a long time.