When buying old yorkstone, ask if the paving slabs have been sourced from a mill. Some demolition sites provide yorkstone at less expensive cost but with the possibliity of the paving slabs being contaminated with oil which cannot be seen initially but will be drawn out on warm sunny days. Also ask if the slabs are in stock as often people are given a cheaper price but the seller doesn't have the slabs in stock - as he is buying from someone else. WE DO NOT BUY SLABS FROM MILLS   more »