A new code of practice for Green Deal providers etc has been launched by the Department of Energy and Climate Change (DECC).
DECC writes:
This code of practice is issued by the Secretary of State for Energy and Climate Change under regulation 10 of the Framework Regulations and sets out requirements for those persons acting as Green Deal Providers, Green Deal Assessors, or Green Deal Installers, or Certification Bodies. It substitutes and revokes the Green Deal code of practice issued on 25th January 2013.
UK Government Publications: LINK