Environment Agency

Scottish Natural Heritage

English Nature

Countryside Commission for Wales

RSK Consultants

Environmental Resources Management

Bullen Consultants

R. Frith & Associates Ltd.

AMOCO

TRANSCO

Gillespie's

W.S. Atkins-Northern

WBB Devon Clays Ltd.

British Coal Opencast

Sunderland MBC

Shanks Waste Solutions (formerly Rechem)

Robinson Penn

Macauley Research Institute

Scottish Agricultural College

South Tyneside Metropolitan Borough Council

Durham Wildlife Trust