Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Plymouth Devonport (UK Parliament constituency)
Table title:
MPs 1918–2010
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > Election </th><th colspan=1 rowspan=1 > Member </th><th colspan=1 rowspan=1 > Party </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1918 </td><td colspan=1 rowspan=2 > Clement Kinloch-Cooke </td><td colspan=1 rowspan=1 > Coalition Conservative </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1922 </td><td colspan=1 rowspan=1 > Conservative </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1923 </td><td colspan=1 rowspan=3 > Leslie Hore-Belisha </td><td colspan=1 rowspan=1 > Liberal </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1931 </td><td colspan=1 rowspan=1 > Liberal National </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1942 </td><td colspan=1 rowspan=1 > National Independent </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1945 </td><td colspan=1 rowspan=1 > Michael Foot </td><td colspan=1 rowspan=1 > Labour </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > 1955 </td><td class="highlighted"  colspan=1 rowspan=1 > Dame Joan Vickers </td><td class="highlighted"  colspan=1 rowspan=1 > Conservative </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Feb 1974 </td><td colspan=1 rowspan=4 > David Owen </td><td colspan=1 rowspan=1 > Labour </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1981 </td><td colspan=1 rowspan=1 > Social Democrat </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > Social Democrat (1988) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1990 </td><td colspan=1 rowspan=1 > Independent </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1992 </td><td colspan=1 rowspan=1 > David Jamieson </td><td colspan=1 rowspan=1 > Labour </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2005 </td><td colspan=1 rowspan=1 > Alison Seabeck </td><td colspan=1 rowspan=1 > Labour </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2010 </td><td colspan=2 rowspan=1 > Constituency abolished: see Plymouth Moor View and Plymouth Sutton and Devonport </td></tr>
</table>
Question:
How long did the longest-serving MP of Plymouth Davenport serve for and who was it?
Answer:
One of Plymouth Devonport's longest serving MPs was the Conservative Dame Joan Vickers, who held the seat from 1955 until the Election of February 1974.