Here is a collection of resources for small businesses.
Dee Blick's Marketing Gym
Dee Blick is a Marketing expert offering specialist advice to small businesses. Her book "Powerful Marketing on a Shoestring Budget for Small Businesses" is excellent.
Business Link
Business Link is a free business advice and support service, available online and through local advisers. It is developed in partnership with subject experts within government and relevant business-support organisations to help you comply with regulations and improve your performance.