CHRIS Basham has hailed the improved defensive resolve at Sheffield United and revealed clean sheets are a cause for celebration in the changing room.Blades boss Paul Heckingbottom has helped make United’s backline a tough nut to crack in recent months and the veteran defender says the work in training is paying dividends in matches. The 33-year-old said: “There’s a lot more steel about ourselves. Not just at the back, it’s togetherness in the full group.“Paul takes the back three to one side and works on individual stuff, we are reaping re...