Erin Patterson argues mushroom murder convictions should be quashed due to ‘catastrophic’ failure of justice

Erin Patterson is appealing against her convictions for three counts of murder and one count of attempted murder over a beef wellington lunch that contained deadly mushrooms. Photograph: Jason Edwards/AP

Lawyers for Erin Patterson have argued that allowing jurors to stay in the same hotel as police and the prosecution while they deliberated over their verdicts in the triple-murder trial represented a “catastrophic” failure of the justice system.

But the prosecution say it was far from a catastrophe, and showed the system worked as it should.