| Aggregate Industries Ltd Cemex Ltd Clearwell Quarries Ltd Harvey Stone Ltd Hills Minerals and Waste Ltd J Wainwright and Co Ltd S Walsh and Sons Ltd Tarmac Ltd Wienerberger Ltd (formerly Baggeridge Brick) in conjuction with Quarryplan Ltd The Acheson and Glover GroupBarr Quarries Ltd Creagh Concrete Ltd Goode Concrete Ltd J Robinson and Sons Ltd Norman Emmerson and Sons Ltd Northstone Ltd OMYA Ltd P Clarke and Sons Ltd The Quinn Group Tobermore Concrete Products Ltd Whitemountain Quarries Ltd |