Chartered Institute of Patent Attorneys (http://www.cipa.org.uk/)
The professional body for UK patent attorneys.

Department for Innovation, Universities and Skills (http://www.dius.gov.uk/policy/innovation.html)
Official UK government website for innovation and business.

ideas21 (http://www.ideas21.co.uk/)
ideas21 are a UK invention and innovation network supported by government, industry and private organisations to inform and educate its members on all areas relating to the successful progression from idea to commercialisation.

Institute of Patentees and Inventors (http://www.invent.org.uk/)
A not-for-profit association for inventors.

National Federation of Enterprise Agencies (http://www.nfea.com/)
Support for start-ups, microbusinesses and the self-employed from Enterprise Agencies.

UK Department for Business Enterprise & Regulatory Reform (http://www.berr.gov.uk/)
Official government website with lots of free business information and links to other sources.