One of my sons has been in sports retail all his working life,including retail manager at a premier league club,and he did'nt know the significance of this.He said fans are constantly having their own wording on shirts and provided it's not knowingly offensive(ie,swear words)they will print it.I think the idiot who ordered the shirt should be prosecuted for Incitement.If the police wont do it maybe the Hillsborough Committee could take out a private prosecution?