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Westminster can revoke it- but it's up to the EU to accept it.
Article 50 triggered a legal process- one over which we have zero control.
So yes, we can revoke it- essentially saying that we wish to reverse our decision, but the EU has to then accept that.
Analogies are dangerous when dealing with matters of international law- but, imagine you have dumped your partner, is it exclusively up to you to decide if you get back together again?
I didn’t realise that was news, it’s always been the case?