The Inventors Handbook (http://www.epo.org/topics/innovation-and-economy/handbook.html)
Highly recommended. A basic guide to the key stages of turning an invention into a commercial product, written by Graham Barker, author of a "A Better Mousetrap."

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.

IP Advantage: Case studies on Intellectual Property (http://www.wipo.int/ipadvantage/en/)
Database gateway to case studies offering real world examples of how intellectual property (IP) works. You can search by different criteria, including by type of protection, to see how IP has been put into practice.

Mandy Haberman (http://www.mandyhaberman.com/)
The website of a successful award-winning English inventor who triumphed against the odds in both the marketplace and the courts.

A Better Mousetrap: the business of invention (http://www.abettermousetrap.co.uk/)
Assesses inventions, advises inventors and publishes the indispensable inventors’ guide A Better Mousetrap: the business of invention.

Trevor Baylis Brands plc (http://www.trevorbaylisbrands.com)
A company set up by the inventor of the clockwork radio to provide assistance and advice to inventors. Useful free information on the website. Charges are made for invention assessments.

Wessex Round Table of Inventors (http://www.wrti.org.uk)
Useful gateway site to listings of UK inventors’ groups.

Alliance against IP Theft (http://www.allianceagainstiptheft.co.uk/)
A coalition of British trade associations and industry enforcement organisations dedicated to protecting intellectual property rights.