www.wyjs.org.uk/archaeological-services/

ASWYAS regularly undertakes excavation, building recording and desk-based work in the north of England, Midlands and East Anglia, and geophysical surveying on a nationwide basis.
ASWYAS is an IfA Registered Organisation.

http://archaeologydataservice.ac.uk/archives/view/greylit/browse.cfm?unit=Archaeological%20Services%20WYAS