Say what you will about King Charles’s previously fanfared vision for a “slimmed-down monarchy”, its injury woes suggest it could do with buying another striker. If that isn’t how it works, then it’s clear that despite thinking they are the greatest fans in the world, many diehard royalists are simply not happy with what they’re seeing out there on the pitch, and are voicing their increasingly hysterical discontent. The king’s cancer treatment and the Princess of Wales’s convalescence from abdominal surgery have come at the same time, and social media is awash with the type…