returned to London this week to celebrate the 10th anniversary of the Invictus Games.But hopes for a royal reconciliation were slashed later that day when Harry’s reps confirmed to The Post that he would not meet with his estranged father due to the king’s “full” schedule.And on Wednesday, the estranged duo’s rift was on clear display as the king hosted a garden party — his first since his cancer diagnosis — at Buckingham Palace for some 8,000 guests.At the same time — just 2.6 miles away — Harry gave a reading at London’s St Paul’s Cathedral to mark a decade since the inaugural Invictus Games took place in the capital.Over at the palace, the monarch, 75, was joined by his wife, Queen Camilla, the Duke and Duchess of Edinburgh, Princess Anne, and the Duke and Duchess of Gloucester.Harry, for his part, arrived at his event alone.Inside, he was joined by his late mother Princess Diana’s relatives, including his uncle and aunt Earl Spencer and Lady Jane Fellowes, who greeted the Duke with a hug.Harry appeared to be in good spirits as he beamed from ear to ear upon arrival, waving to excited fans lining the streets of London.He later joined Invictus competitors and staff for a reception in the cathedral’s crypt, before diving into endless meetings for the rest of the day.Prince William did not attend either event, instead carrying out a royal engagement at Windsor Castle Wednesday morning spending the day with his cancer-stricken wife Kate Middleton and their three children.