By Ryan Merrifield Prince William has “always made clear” that Kate, Princess of Wales is his “priority”, as the King battles cancer, insiders claimed. The heir to the throne, 41, has stopped royal duties to care for his wife, 42, after her abdominal surgery last month. He will return to public engagements on Wednesday when he is due to host an investiture at Windsor Castle. That evening he will then attend the London Air Ambulance fundraising gala in London’s Raffles Hotel. However, the Prince of Wales is not expected to return to full-time duties yet and “remains focused” on Kate and childre…