Modified Ultra Vires Theory: Constitutional Necessity
UV supporters believe that only MUV coheres with Parl Sov and that it is this very meaning of PS that demands adherence to the UV model. This is based on the Forsyth’s idea that what an all-powerful Parliament does not expressly prohibit, it must authorise (either expressly or impliedly). If this were not so the assumption would be that Parliament did not intend the constraints on statutory power to exist.
As a consequence: judicial power is contingent on finding consent to limits read into legislation. It does not suffice on this model that Parliament can reject and change any conditions imposed by courts.
Problem I: “the unexpressed middle” = Parl may not have any intent about a matter one way or the other
Problem II: if it is true, then it has the consequence that LI must be regarded as the foundation for all bodies of law, including private law, where the common law principles are read into legislation.
Problem III: CL model is in accordance with ‘classic continuing sovereignty model’ - embodies the idea of legislative omnipotence in the sense of ability to change.
Consequence: it’s totally legitimate to say judicially created controls apply unless Parliament has indicated otherwise in pursuance of its continuing sovereignty. We just have to prove that the continuing model should be adopted – Craig says this model is consistent with history, case law and principle.










