Weather world looks back at some of the most significant meteorological events of the year the duke of edinburgh has left hospital where he was being treated for what officials describe as a pre existing the duke walked out of the king edward vii hospital in central london, and got into a car before being driven away. He travelled to the hospital on friday as a precautionary measure. Buckingham palace say his four night stay was for observation and treatment. The duke is now back at sandringham where he is expected to spend christmas with the queen. In a moment we will be speaking to our correspondent, Charlotte Gallagher, who is at sandringham. But first, lets go tojohn mcmanus who is in central london, outside the hospital where Prince Philip was receiving treatment. Do we know why Prince Philip was in hospitalfor do we know why Prince Philip was in hospital for the last few days . Very good to see him walk out himself. We dont know why he was brought here on friday to king edward se