The Northumberland Plate takes centre stage on ITV Racing this Saturday and pundit previews all the live action from Newcastle and York. 13:40 NEWCASTLE A step up to seven furlongs appeared to spark improvement from five-year-old Sergeant Wilko, who went close in a weaker contest at Thirsk last time out. He returns to a venue where he has tasted success before and now races from a mark below his last winning rating. The slight concern is his wider draw, but on Newcastle's st