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Acanthus Holden Architects: nine staff in Pembroke, Wales.

Community architecture and conservation, which informs materials choice. 20+ years of sustainability

Architype: 29 staff, in Upper Twyford, near Hereford (12) and London (17). Clients mostly look for sustainability. Genesis building study AJ 08.06.06. Healthy buildings. Natural technologies

Associated Architects: 48 staff in Birmingham. Mostly commercial.

Now greening through BS 14001 implementation and forming a green team - part of all projects

Atelier Ten: 56 staff, in London (44) and New York (12). Engineer which brings green strategy to many architecture projects. And a US perspective. Advocates UK Green Building Council

Atkins: 35 staff in Leeds, part of Atkins Global's 15,000 staff. Much local public sector work. Partnering. Specialists push practice forward. Systems more informal than formal. BS 14001

BBM Sustainable Design: six staff in Lewes, West Sussex.

Developing a regional architecture. Very hands-on in sourcing materials and on site. Natural materials

ECD: 15 staff in London. Very focused on sustainability, and on energy within that. Architecture and consultancy, including ECD Project Services. Own green building refurb

Feilden Clegg Bradley: 120 staff in Bath (80) and London (40).

More mainstream clients in future? Design Matrix great for setting priorities. Clever intranet - anyone can upload. Bikes

Jestico + Whiles: 95 staff, in London (80) and Prague (15). Very committed to community and regeneration. BS 14001. Learning as a key practice activity. Employee Benefit Trust

John Gilbert Architects: 10 staff in Glasgow. Community architecture background. RIAS accredited. Regional design with climate. Recycled components. Carbon footprints

Jon Broome Architects: 1.5 staff in Lewisham, SE London. Live/work in self-build house. Promotes self-build. Very hands-on in sourcing and on site. Design for exibility/longevity

Mansel Architects: two staff in Belper, Derbyshire. Community architect in small working town, committed to regeneration.

Simple, healthy buildings. Local materials sourcing

MAST Architects: 14 staff in Glasgow. Background in tenement rehab - social focus. RIAS accredited. Local sourcing means jobs as well as embodied energy. Scottish timber industry

PRP: 340 staff, in Surrey (150), London (140), Milton Keynes (30) Manchester (20). Core is social housing. BS 14001 planned. PRP Environmental Services. New researchers. Bikes

White Design: 14 staff in Bristol. Mainly public sector. Sustainability a 'mission for us'. 'Builder of the Month' award. Pioneering use of materials; very hands-on. Practice allotment

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