R.S. components or Maplins have a wide range of tiny internal fuses they are probably your best bet. They have stores nationwide and are online too. I would be suprised if they don't have one, if they don't then you will struggle unless you have a local electronics/repair component shop in your area.
here is a link to R.S. website:
http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?obs=sObs&name=SiteStandard&No=0&N=0&Ntk=I18NAll&Ntt=fuses&Nty=1&D=fuses&Ntx=mode%20matchpartial&Dx=mode%20matchpartial&callingPage=/jsp/homePage/homePage.jsp&BV_SessionID=@@@@2109393350.1173270033@@@@&BV_EngineID=ccdeaddkgdfjfjlcefeceeldgondhgl.0&cacheID=ukie&Nr=avl:uk
Fletch
March 2007