HM Revenues & Customs have produced a guide to assist you filling in your paper tax return.
Read the guide to filling in your tax return.
HMRC say it is important that you read and understand the first two pages before you start the form. Then, once you have completed the paper tax return, send it must reach them by 31 October 2010.
Alternatively, why not file online? It is secure, convenient and there is on-screen help if you need it. You get an extra three months to finish the form as online returns are due by 31 January 2011.
Go to www.hmrc.gov.uk
and under 'do it online' select Self Assessment.