Magna Carta established the principle that the executive does not have the right to set aside Parliament which is the representative of the kingdom. Every attempt to repeat John's assumption of executive supremacy has been recognised as being against the fibre of the English system. The constitutional monarchy came into being because the last monarch to presume absolute power was run out of town and a suitably obedient replacement invited. The executive only has power because they command the confidence of Parliament. If they do not, they do not have the right to set Parliament aside for the sake of their convenience.
That's the constitutional principle side of things. The other part of the court judgment is that the PM is a lying so and so.
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