He wasn't accompanied by his wife Meghan Markle who has been advised not to travel given her pregnancy. There is also a limit of 30 on the number of people who can attend the funeral at St.George's Chapel due to Covid restrictions.
Harry took a British Airways flight back to the UK from L.A. and was met by security and whisked away to Kensington Palace in a black Range Rover. He was now quarantine for just 5 days instead of the usual 10 days on compassionate grounds.