Stella tips Norris for world championship, but on one condition

Andrea Stella can be proud with a fourth place in the constructors' championship. They started the season in Bahrain with a DNF and a 17th place and ended the season in Abu Dhabi with a fourth and sixth place. On top of that, nine podiums and a sprint win and things are looking good for the Woking-based team. What does team boss Andrea Stella think of last season?