Jez is not a Geordie but a County Durham lad. Durham has several quite different accents to the Tyneside creole.

I don't mind someone having a go at an accent so long as they don't balls it up. Some have failed spectacularly: Dick van Dyke's cockney in Mary Poppins and Robin William's 'English' Mrs. Doubtfire spring to mind. What about Mick Jagger whose normal accent is an effette South London and sings like he's from the US Mid-West?