Spray a large saucepan about 5 times with the low fat cooking spray. Turn the heat on high and when the oil begins to bubble a little, turn the heat down to medium.
Add the broccoli florets and vegetable stock. Bring to the boil and then simmer for approximately 15 – 20 minutes.
Blitz the soup in a blender or a food processor.
Return the soup to the pan and bring it back to the boil and then turn down to simmer and then stir in the soft cheese first and then the blue stilton.
Stir the soup well to ensure all the cheese has melted, season to taste and then serve in bowls with fresh crusty bread.