This is a question on the balance between Rule of Law and Parliamentary Sovereignty.
I can't remember the case, but there is a judgement or academic paper where a LJ states that if Parliament were to act in a way so drastic, it would be for the Courts to respond in kind. For example - a law is passed stating all the firstborn should be executed. Even if this is passed, the Courts would refuse to implement it - which would of course spark a constitutional crisis.
Dicey has written many books on the question you are being asked. The Separation of Powers between the Executive and Parliament might also be worth touching on.