Final answer:
The difference between discretionary powers now and when Dicey was writing is that today, there is a greater recognition of the need for flexibility and adaptation in interpreting and applying the law.
Step-by-step explanation:
The difference between discretionary powers now and when Dicey was writing is that today, there is a greater recognition of the need for flexibility and adaptation in interpreting and applying the law. In the past, the Constitution was seen as a set of unchanging and fixed laws, but in the 20th century, jurists began to view it as more flexible and relative to different factors. This shift in perspective allows for a more nuanced understanding and exercise of discretionary powers.