<div class="report-a-problem">
  <h2>Help us improve GOV.UK by telling us:</h2>
  <form accept-charset="UTF-8" action="/feedback" method="post">
    <label for="what_doing">
      What were you trying to do
      <input id="what_doing" name="what_doing" type="text" />
    </label>

    <input type="hidden" id="what_wrong" name="what_wrong" value="broken link (404)" />

    <input type="hidden" name="utf8" value="✓" />
    <button name="commit" type="submit" class="button">Send</button>
  </form>
</div>

<div class="report-a-problem">
  <h2>Help us improve GOV.UK by telling us:</h2>
  <form accept-charset="UTF-8" action="/feedback" method="post">
    <input id="source" name="source" type="hidden" value="page_not_found">
    <label for="what_doing">
      What were you trying to do
      <input id="what_doing" name="what_doing" type="text" />
    </label>

    <input type="hidden" id="what_wrong" name="what_wrong" value="broken link (404)" />

    <input type="hidden" name="utf8" value="✓" />
    <button name="commit" type="submit" class="button">Send</button>
  </form>
</div>

Include source in 404 report problem form
Include source in 404 report problem form
