Allen Archaeological Associates. Archaeological Consultant: www.allenarchaeology.co.uk 

The International Society for Archaeological Prospection. www.brad.ac.uk/acad/archsci/archprospection/

The Institute of Field Archaeologists. www.archaeologists.net

The English Heritage Geophysical Survey Database. http://sdb2.eng-h.gov.uk/

The Great War Archaeology Group.  First World War archaeology. www.gwag.org

The Sedgeford Historical And Archaeological Research Project: www.sharp.org