anchor.diff:            <h2 id="government-buildings">Government buildings</h2>
             <p>Number 10, Downing Street may have the world&rsquo;s most famous front door, but the real treasures lie inside. Take the virtual tour, or explore the secrets and stories of other buildings throughout Whitehall and beyond:</p>
             <ul>
  -            <li><a href="#">10 Downing Street</a></li>
  -            <li><a href="#">11 Downing Street</a></li>
  -            <li><a href="#">FCO Buildings</a></li>
  -            <li><a href="#">MOD Whitehall</a></li>
  -            <li><a href="#">1 Horse Guards </a></li>
  -            <li><a href="#">Government Offices Great George Street</a></li>
  -            <li><a href="#">Hillsborough Castle</a></li>
  +            <li><a href="http://www.number10.gov.uk/history-and-tour/virtual-tour-of-number-10/" rel="external">10 Downing Street</a></li>
  +            <li><a href="http://www.hm-treasury.gov.uk/about_11downingst.htm" rel="external">11 Downing Street</a></li>
  +            <li><a href="http://www.fco.gov.uk/en/about-us/our-history/our-buildings/" rel="external">FCO Buildings</a></li>
  +            <li><a href="http://94.236.30.88/DefenceInternet/AboutDefence/History/HistoryOfTheOldWarOffice/ModMainBuilding.htm" rel="external">MOD Whitehall</a></li>
  +            <li><a href="http://www.hm-treasury.gov.uk/about_1hgr.htm" rel="external">1 Horse Guards </a></li>
  +            <li><a href="http://www.hm-treasury.gov.uk/about_1hgr.htm" rel="external">Government Offices Great George Street</a></li>
  +            <li><a href="/hillsborough-castle">Hillsborough Castle</a></li>
             </ul>
           </div>
         </div>
  
positive.code:           <h2 id="documents-records">Documents and records</h2>
            <p>Letters and treaties, maps and portraits, photos and websites &ndash; important sources of information and part of the fabric of history. You can investigate further at:</p>
            <ul>
              <li><a href="#">The National Archives: UK Government Web Archive</a></li>
              <li><a href="#">Government Art Collection</a></li>
            </ul>
          </div>
        </div>
  
negative.code:         <h2 id="historical-research">Historical research</h2>
          <p>History is changing all the time as new evidence and new perspectives emerge. Historians can help us make sense of this shifting landscape &ndash; through articles, seminars and exhibitions. You can find out more by exploring these series:</p>
            <ul>
              <li><a href="http://www.number10.gov.uk/history-and-tour/guest-historians/" rel="external">No 10 guest historians</a></li>
              <li><a href="http://www.fco.gov.uk/en/about-us/our-history/fco-historians/" rel="external">FCO historians</a></li>
              <li><a href="https://itunes.apple.com/gb/podcast/foreign-commonwealth-office/id391720925" rel="external">FCO history podcast</a></li>
            </ul>
        </div>
      </div>
  