anchor.diff:  http://www.number10.gov.uk/history-and-tour/james-callaghan,http://www.number10.gov.uk/past-prime-ministers/james-callaghan,301
   http://www.number10.gov.uk/history-and-tour/james-ramsay-macdonald,http://www.number10.gov.uk/past-prime-ministers/james-ramsay-macdonald,301
   http://www.number10.gov.uk/history-and-tour/john-major,http://www.number10.gov.uk/past-prime-ministers/john-major,301
  -http://www.number10.gov.uk/history-and-tour/larry-the-cat-chief-mouser-to-the-cabinet-office,,410
  +http://www.number10.gov.uk/history-and-tour/larry-the-cat-chief-mouser-to-the-cabinet-office,https://www.gov.uk/government/history/10-downing-street#larry-chief-mouser,301
   http://www.number10.gov.uk/history-and-tour/lord-grenville,http://www.number10.gov.uk/past-prime-ministers/william-wyndham-grenville-1st-baron-grenville,301
   http://www.number10.gov.uk/history-and-tour/lord-north,http://www.number10.gov.uk/past-prime-ministers/lord-frederick-north,301
   http://www.number10.gov.uk/history-and-tour/margaret-thatcher-2,https://www.gov.uk/government/history/past-prime-ministers/margaret-thatcher,301
  
positive.code: http://www.number10.gov.uk/topstorynews/feed,https://www.gov.uk/government/announcements.atom?announcement_type_option=news-stories&departments%5B%5D=prime-ministers-office-10-downing-street,301
  http://www.number10.gov.uk/transparency,,410
  http://www.number10.gov.uk/transparency/business-plans-archive,https://www.gov.uk/government/publications?keywords=business+plan&publication_filter_option=transparency-data&topics%5B%5D=all&departments,301
  http://www.number10.gov.uk/transparency/contracts-in-full,,410
  http://www.number10.gov.uk/transparency/find-all-other-government-data,http://www.number10.gov.uk/transparency/find-other-government-data,301
  http://www.number10.gov.uk/transparency/find-other-government-data,,410
  
negative.code: http://www.number10.gov.uk/tag/structural-reform-plans,,410
  http://www.number10.gov.uk/take-part,https://www.gov.uk/government/get-involved#take-part,301
  http://www.number10.gov.uk/take-part/bigsocietyawards,,410
  http://www.number10.gov.uk/take-part/business,https://www.gov.uk/government/get-involved#take-part,301
  http://www.number10.gov.uk/take-part/business/become-a-special-constable,,410
  http://www.number10.gov.uk/take-part/community-safety,https://www.gov.uk/government/get-involved#take-part,301
  http://www.number10.gov.uk/take-part/community-safety/become-a-special-constable,https://www.gov.uk/police-community-support-officers-what-they-are,301
  http://www.number10.gov.uk/take-part/community-safety/neighbourhood-watch,https://www.gov.uk/government/get-involved#take-part,301
  http://www.number10.gov.uk/take-part/community-safety/police-beat-meetings,,410
  