Thirty-four people died in Australia in 2019 as the worst bush fires in living memory swept across the country. An area roughly the size of England was devastated and thousands of homes were destroyed. A year on, Panorama hears from the people living in the path of the fires and the firefighters who risked their lives to save them. And as this year's fire season gets underway, Clive Myrie asks if these levels of destruction are to become normal.