The coronavirus outbreak could see Prince Harry forced to return to the UK thanks to an old law. In 1911, then-monarch King George V created what is called the Counsellors of State.
This means that if the Queen cannot carry out her official duties because of illness or because she is abroad, two or more Counsellors can be appointed to take over her duties, such as signing documents, appointing judges, receiving new Ambassadors and preside over Privy Council meetings.
The last time this was used was in 2015 when the Queen appointed Counsellors of State when she went to Malta for the Commonwealth Heads of Government Meeting.