HMRC Businesses & Corporations
http://www.hmrc.gov.uk/businesses/index.shtml
PAYE Manual
http://www.hmrc.gov.uk/manuals/pommanual/index.htm
Capital Gains Manual
http://www.hmrc.gov.uk/manuals/cgmanual/index.htm
VAT Rates, Thresholds, Fuel Scale Charges, & Exchange Rate
http://www.hmrc.gov.uk/vat/forms-rates/rates/index.htm
Self Employment
http://www.hmrc.gov.uk/selfemployed//index.shtml
Employers