anchor.diff:  "Human Tissue Authority",http://www.hta.gov.uk
   "National Institute for Biological Standards and Control (NIBSC)",http://www.nibsc.ac.uk
   "National Institute for Health and Clinical Excellence (NICE)",http://www.nice.org.uk/
  -"NHS",http://www.nhs.uk,"and all subdomains"
  +"National Health Service (NHS)",http://www.nhs.uk,"and all subdomains"
   "Child Maintenance and Enforcement Commission",http://www.cmoptions.org
   "Health & Safety Laboratory (HSL)",http://www.hsl.gov.uk
   "Health and Safety Executive",http://www.hse.gov.uk
  
positive.code: "The Judicial Committee of the Privy Council",http://www.jcpc.gov.uk
  "The Legal Ombudsman",http://www.legalombudsman.org.uk/
  "The Supreme Court of the United Kingdom",http://www.supremecourt.gov.uk
  "TNA",http://www.nationalarchives.gov.uk
  "UK Statistics Authority",http://www.statisticsauthority.gov.uk/
  "Office National Statistics",http://www.ons.gov.uk
negative.code: "Waste and Resources Action Programme (WRAP)",http://www.wrap.org.uk
  "Joint Nature Conservation Committee",http://jncc.defra.gov.uk/
  "Consumer Council for Water (CCWater)",http://www.ccwater.org.uk/
  "Children and Family Court Advisory and Support Service (Cafcass)",http://www.cafcass.gov.uk
  "Examinations Appeals Board",http://www.theeab.org.uk
  "Independent Commission for Aid Impact",http://www.independent.gov.uk/icai
  "Directly Operated Railways",http://www.directlyoperatedrailways.co.uk
  