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DEFRA: https://www.gov.uk/contaminated-land
Has links to the relevant statutory guidance on contaminated land.
European Commission Liability pages: http://ec.europa.eu/environment/soil/index_en.htm
A good source of European materials including a number of comparative studies of contaminated land legislation across the world.
Contaminated Land Rehabilitation Network for Environmental Technologies in Europe (Clarinet): www.umweltbundesamt.at/en/umweltschutz/altlasten/projekte1/international1/clarinet
For those interested in the technical aspects of contaminated land this provides an excellent database of materials and other resources dealing with the approaches taken across Europe to address contaminated land.