| www.hmrc.gov.uk | - | Inland Revenue |
| www.sage.co.uk | - | Sage software |
| www.icaew.co.uk | - | Institute of Chartered Accountants |
| www.acca.co.uk | - | Association of Chartered Certified Accountants |
| www.cch.co.uk | - | CCH software |
| www.companieshouse.co.uk | - | Companies House |