app/views/admin_request/_params.html.erb
<% params[:new].each do |key, value| %>
<em><%= key %>:</em>
<%= MySociety::Format.wrap_email_body_by_lines(h(params[:old][key])).gsub('\n', '<br>').html_safe %>
=>
<%= MySociety::Format.wrap_email_body_by_lines(h(value)).gsub('\n', '<br>').html_safe %>
<br>
<% end %>
<% params[:other].each do |key, value| %>
<em><%= key %>:</em>
<%= value %>
<br>
<% end %>