Even on The Real Housewives Of London, Meghan Markle is creating drama. Sadly, that’s not because the Duchess of Sussex is making a glittering return to the UK to join the latest Housewives franchise.

Castle Gwynn isn’t some Disney-inspired tourist trap with plastic turrets and gift shops selling foam swords. This is the real deal – a genuine, stone-by-stone labor of love that looks like it was ...