Here are a few useful links for finding out more about specific tax issues.

• HM Revenue and Customs
• HMRC Online Payment Service
  You can now pay your tax bill by debit or credit card. Please note for credit cards a non-refundable transaction fee of 1.4% is added to the charge.
• Taxation Web
  Online tax community
• Business Rates Info
• Association of Accounting Technicians
• Companies House 

• Tax Aid
  UK charity providing free tax advice to people who cannot afford to pay a professional advisor
• Professional Contractors Group
  Lots of IR35 assistance