British Library- Business & IP Centre [link]
Information on almost every industry you can think off. They have information pointing to various useful databases, publication and websites that will advise you on various parts of different industries.
Business Link [link]
Information on everything a new business (or even existing business) will need to succeed in all aspects of business - startup to managing your business.
The Business Map [link]
The business map is an initiative led by the East of England Development Agency (EEDA) that basically is a collection of all the business support available in the region (also useful for everyone else in the country) listing advice, support and help about everything from finding manufacturing advice to how best to create business opportunities from the Olympics!
Young Entrepreneur [link]
This site has everything from a forum to discuss and give/receive advice, to and ‘ask an expert’ section, startup directory, blog for latest commentary and even a tools and services database of pre-screened vendors. A must visit for any budding entrepreneur.