Authorising your agent
http://www.hmrc.gov.uk/forms/64-8.pdf
Registering for Self Assessment and National Insurance contributions if you are a self-employed sole trader.
http://www.hmrc.gov.uk/forms/cwf1.pdf
http://www.hmrc.gov.uk/forms/ch2-online.pdf
Claim for repayment of tax deducted from savings and investments
http://www.hmrc.gov.uk/forms/r40.pdf
Registering for Self Assessment and getting a tax return
Leaving the UK
http://www.hmrc.gov.uk/cnr/p85.pdf
Self Assessment claim to reduce payments on account