Newcastle United would be making a huge mistake if they left St James’ Park and built a new stadium. That is the view of pundit Ally McCoist, who has begged Newcastle to stay where they are rather than relocate amid speculation that a change could be on the horizon. Ever since the change of ownership, the demand for tickets on Tyneside has gone up. St James’ Park is always full, leading to the club exploring the possibility of expanding it. However, given its location in the centre of the city, that is easier said than done. That led to a survey going out to fans this week, canvassing opinion …