www.statistics.gov.uk This is the site of the National Statistics
Office. It's updated regularly.
www.hmrc.gov.uk A really excellent site. Advice for
small businesses and those going self-employed. It's surprisingly
helpful and full of useful information.
www.companies-house.gov.uk This provides information for limited
companies, including name searches and basic company information.
www.dti.gov.uk The DTI website has a wide range of
information, including grants, exporting and industry specific
issues.
