| Francis Clark | www.francisclark.co.uk |
| HMRC | www.hmrc.gov.uk/cis |
| Companies House | www.companieshouse.gov.uk |
| Chartered Institute of Taxation | www.tax.org.uk |
| Institute of Chartered Accountants in England & Wales | www.icaew.com |
| Construction News | www.cnplus.co.uk |