Prince William opened up on how Princess Kate feels about missing Royal Family duties. The prince made a surprise visit to St Michael’s Church of England High School on Thursday where he spoke about his wife, Kate. The Princess of Wales is currently unable to perform public duties as she undergoes a course of “preventative” chemotherapy. At the school, Prince William told a member of staff: “I am sorry Catherine can’t be here as well. She would have loved to.” In an emotional video filmed in Windsor last month, the princess confirmed that she has been diagnosed with a form of cancer. William a…