It is anomalous for the Crown to be able to exercise public powers without parliamentary authority, on the basis of mediaeval notions of kinship through crown ministers.
Parliamentary involvement is dependent on the good will of the executive.
Allowing the Prime Minister to take the decision alone can lead to decisions being taken in a vacuum.
Going to war without formal parliamentary approval can lead to lower morale amongst the armed forces, as they are not certain the country supports them.
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