message: Add SPD stats
diff: <th>&nbsp;</th>
  <th>ONS Postcode Directory</th>
  <th>OS Open Names</th>
  + <th>Scottish Postcode Directory</th>
  </tr>
  </thead>
  <tbody>
  <td>Release Date</td>
  <td>August 2019</td>
  <td>July 2019</td>
  + <td>February 2019</td>
  </tr>
  <tr>
  <td>Data Points</td>
  <td>1,760,427 (1.6%)</td>
  <td>42,969 (+30)</td>
  + <td>157,872</td>
  </tr>
  </tbody>
  </table>
  