These are available online at www.hmrc.gov.uk

A01 How to complain about the Inland Revenue and the Valuation Office Agency
CA01 National Insurance contributions for employees
CA08 Voluntary National Insurance contributions
CA13 National Insurance contributions for women with reduced elections
CA25 Agencies and people working through agencies
CA72 National Insurance contributions: defering payment
Code of Practice (COP) 1Putting things right when we make mistakes
COP10 Information and advice
COP11 Self assessment. Local office enquiries
COP20 National minimum wage - information for workers
IR33 Income tax and school leavers
IR37 Appeals
IR41 Income tax and job seekers
IR60 Students and the Inland Revenue
IR120 You and the Inland Revenue National Insurance Contribtions Office
IR235 Calculation of student loan repayments on an income contingent student loan