Lady Colin Campbell is not a fan of King Charles III’s “slimmed-down monarchy,” and the outspoken aristocrat has labeled the decision a “terrible mistake” in the wake of His Majesty’s cancer diagnosis. The bestselling author feels that there are “too few working feet on the ground” when Kate, Princess of Wales’ surgical recovery is considered as well. During an interview with GBN’s Nana Akua, Lady C mentioned that Prince Edward and Sophie, Duchess of Edinburgh’s children, Lady Louise Windsor and James, Earl of Wessex, should be elevated to working royals. “He’s a really nice man, and I don’t k…