You will also be required to make weekly Class 2 NI contributions of £2.05 per week. If you earn over £4 895 (during the 2005/6 tax year), you will also become lible for Class 4 NI.
The easist way to make these contributions is by Direct Debit. Further information on setting up and paying Class 2 and 3 contributions by Direct Debit can be found on HM Revenue & Customs website.