Companies House:

Check your accounts online using the free Webcheck Service or search to see if your proposed limited company name is already in use.


HM Revenue & Customs:
 
The Government site where you can find information on VAT, Self Assessment, CIS and Employment related queries.


Sage:

Want to know more about Sage?  Use this site to look at the products on offer.


UK Government Free Advice:

Easy access to the public services you use and the information you need.