What is tax deductible? Manicures? Cosmetic surgery?

[xKatieBabyx]

As has been said above you can claim for anything at all. But it's best to be able to back in up in case you are ever audited. In regards to household bills, these links are handy
http://taxaid.org.uk/situations/self-emp...-as-office
http://taxaid.org.uk/situations/self-emp...siness-use
http://www.hmrc.gov.uk/manuals/bimmanual/BIM47820.htm
http://www.hmrc.gov.uk/manuals/bimmanual/BIM37000.htm