The advantage of using calibrated stone. A "how to" presentation from DT Stone, who supply Sandstone, Travertine, Slate and Limestone Floor Tiles and Paving Stone, patio slab packs and garden stone, from quarries around the world with a wide choice of colours, styles and finishes. You can buy online, over the phone or at their showroom. They supply free samples and have a 3-5 day delivery service nationwide. Shop online at www.dtstone.co.uk.