King Charles has been left furious with Prince Harry and Meghan Markle after the Sussexes embarked on a controversial trip to Nigeria. The 75-year-old monarch, who is recovering from his cancer diagnosis, grew distant from his younger son and daughter-in-law following the couple’s decision to quit the Firm more than four years ago. Despite visiting London on several occasions, the Sussexes relocated from the UK to California via Canada and raised eyebrows by deepening their rift with the Royal Family. Harry and Meghan, who celebrate their sixth wedding anniversary today, embarked on a three-da…