How might legislation that appears contrary to the rule of statute be challenge lower than the Human Rights Act 1998?

I have to answer this question for my regulation exam and I have absolutely no impression about what to write. I've checked on the internet and in books but I can't find anything at adjectives. I would appreciate any help at all.
Answers:
What sort of legislation might appear contrary to the rule of decree?

Maybe something that deprives people of the right to a fair trial? That could be challenge under article 6.

Maybe something that allowed punishment for something that wasn't illegal when it be done? That could be challenged under article 7.


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