anchor.diff:  <% page_title "History of Lancaster House" %>
   <% page_class "histories-show" %>
   <% meta_description "The history of Lancaster House." %>
  -
  + 
   <header class="block headings-block">
     <div class="inner-block floated-children">
       <%= render partial: 'shared/heading',
  
positive.code:                         heading: "Lancaster House" } %>
    </div>
  </header>
  
  <div class="block content-list">
    <div class="inner-block">
      <%= image_tag 'history/buildings/lancaster-house-300.jpg', alt: 'Lancaster house' %>
  
negative.code:     </div>
    </div>
  </div>
   
   
  