Embargoed to 0001 Saturday June 16 File photo dated 18/6/1984 of a twisted sign, felled concrete posts and a broken wall tell the story of violence outside a coking plant in Orgreave, South Yorkshire. Calls for an inquiry into policing during violent clashes with pickets during the miners' strike will be stepped up on Saturday at a rally to mark the 34th anniversary of the so-called Battle of Orgreave.