http://www.litrg.org.uk The LITRG is an initiative of the Chartered Institute of Taxation to give a voice to those who cannot afford to pay for tax advice. Their aim is to make the UK tax system simpler and fairer. The site provides reliable tax and related benefits advice so that people on low incomes who want to try and help themselves can do so.
http://www.taxaid.org.uk/ TaxAid is a UK charity providing free tax advice to people who cannot afford to pay a professional adviser. The service is independent and confidential.