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The competition, which is open to building services engineers, students and other professionals, aims to cut the building's emissions by 60%.

"Achieving 60% carbon emissions reduction will not be easy and will require some innovative thought," says John Field, competition chairman. The headquarters is a large Victorian building with a more modern annexe – similar to many of the buildings used as offices throughout the country.

Students reaching the shortlist will be teamed-up with a major building services consultancy for help with the calculations and detailed planning necessary.

March 2004 is the deadline for proposals. A panel of judges will shortlist competitors and select an overall winner to be announced in May next year.