anchor.diff:          <h2>More sources</h2>
           <p>Many institutions, as well as universities, museums and libraries, hold information about the history of the UK government. The following websites may be useful for further research:</p>
             <ul>
  -            <li><a href="#">Parliament</a></li>
  -            <li><a href="#">The British Library</a></li>
  -            <li><a href="#">English Heritage</a></li>
  +            <li><a href="http://www.parliament.uk/about/living-heritage/" rel="external">Parliament</a></li>
  +            <li><a href="http://www.bl.uk/" rel="external">The British Library</a></li>
             </ul>
         </div>
       </div>
  
positive.code:           <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>
            </ul>
          </div>
        </div>
  
negative.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="http://www.nationalarchives.gov.uk/webarchive/" rel="external">The National Archives: UK Government Web Archive</a></li>
              <li><a href="http://www.number10.gov.uk/history-and-tour/government-art-collection-at-number-10/" rel="external">Government Art Collection</a></li>
            </ul>
          </div>
        </div>
  