Brownfield redevelopment, particularly for new housing, is viewed by authorities and the electorate as preferable to building on greenbelt or floodplains. However, in many cases, brownfield sites have suffered from historical contamination by metals, acidity and/or hydrocarbons. Conventional approaches to remediation, including soil washing and excavation, often make remediation options financially prohibitive. Under the New Regime, identified land contamination needs to be treated such that potential migration of contaminants to human receptors is reduced to an acceptable risk level. Conventionally a variety of stabilisation techniques are used to retain contaminants, notably metals, in place. These include treatment with lime, pulverised fuel ash (PFA) or other materials, many of which are harmful to handle, transient in their treatment effectiveness, or are themselves detrimental to the ecological recovery of the treated area.