Prince William’s former aide, Simon Case, played a pivotal role in Meghan Markle and Prince Harry’s Royal Family exit. Case drafted a key document on the Duke and Duchess of Sussex quitting royal duties, court papers show. This week, Prince Harry lost a High Court battle against the Home Office regarding his security in the UK. The 51-page judgement in the case revealed details about Harry and Meghan stepping down as working royals in 2020. Case authored a paper on behalf of the Royal Family which set out the steps for the Duke and Duchess of Sussex to quit royal duties. Court papers state: “O…