The Federation of Small Businesses is an independent lobby group. The site has a wealth of information including the results of surveys of its members, the in-depth analysis of key business issues, and plenty of practical advice. You can telephone the federation on 01253-336000.
The Institute of Directors produces lots of guidance material, although you'll need to be a member to benefit from most of the services offered by the organisation. Contact them on 020-7839 1233.
This is a good site if you are looking for general business advice. It is part of the government's Small Business Service initiative and its services are provided free of charge.
Check out Business in the Community for tips and advice about how to boost your firm's links with local communities. The site is particularly good for picking up new marketing ideas.
New starters and fledgling enterprises should go here: the Small Firms Enterprise Development Initiative. The network provides support to new business, details of business awards and competitions and plenty of case studies.