Re: From another angle...
Sorry but that is absolutely the case due to UK Parliamentary Sovereignty, whether you or I think it is right or wrong.
Isn't parliamentary sovereignty supposed to be the question at issue? Those who say a Prime Minister can act without it are denying that sovereignty.
Under UK law, only a court can say who's right. Not the PM, nor parliament, nor the people. Indeed (shock, horror) not even Reg commentards.