Sarah Ferguson has issued a pleading public statement on social media following her second “shock” cancer diagnosis. The duchess, 64, took to Instagram today to talk about her cancer diagnoses and to urge Brits not to skip their health check-ups warning, “days could be the difference between life and death”. Last month, Fergie was diagnosed with an aggressive form of skin cancer, only six months after she was treated for breast cancer. The duchess said: “I would like to urge anyone who is able to be diligent with their health checkup. “I’m determined to do whatever I can to help raise awarenes…