www.wsp.com/en-GL/sectors/environment

WSP Environmental, part of the WSP Group, is one of the world’s leading environmental and geotechnical consultancies. With headquarters in London and 14 UK office locations, the Consultancy employs over 380 staff in the UK and has an in-house site investigation and laboratory division. Worldwide, WSP Environmental is 600 strong with offices in South Africa, Poland, Sweden, Middle East, USA and Ireland. WSP Environmental is a Registered Archaeological Organisation with the Institute of Field Archaeologists.

http://archaeologydataservice.ac.uk/archives/view/greylit/browse.cfm?unit=WSP%20UK%20Ltd