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:
Enfield Southgate in the 1997 general election
Table title:
Result
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > Party </th><th colspan=1 rowspan=1 > Candidate </th><th colspan=1 rowspan=1 > Votes </th><th colspan=1 rowspan=1 > % </th><th colspan=1 rowspan=1 > ± </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Labour </td><td colspan=1 rowspan=1 > Stephen Twigg </td><td colspan=1 rowspan=1 > 20,570 </td><td colspan=1 rowspan=1 > 44.2 </td><td colspan=1 rowspan=1 > +18.0 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Conservative </td><td class="highlighted"  colspan=1 rowspan=1 > Michael Portillo </td><td colspan=1 rowspan=1 > 19,137 </td><td colspan=1 rowspan=1 > 41.1 </td><td colspan=1 rowspan=1 > 16.8 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Liberal Democrat </td><td colspan=1 rowspan=1 > Jeremy Browne </td><td colspan=1 rowspan=1 > 4,966 </td><td colspan=1 rowspan=1 > 10.7 </td><td colspan=1 rowspan=1 > 3.8 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Referendum </td><td colspan=1 rowspan=1 > Nicholas Luard </td><td colspan=1 rowspan=1 > 1,342 </td><td colspan=1 rowspan=1 > 2.9 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Christian Democrat </td><td colspan=1 rowspan=1 > Alan Storkey </td><td colspan=1 rowspan=1 > 289 </td><td colspan=1 rowspan=1 > 0.6 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Mal - Voice of the People </td><td colspan=1 rowspan=1 > Andrew Malakouna </td><td colspan=1 rowspan=1 > 229 </td><td colspan=1 rowspan=1 > 0.5 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td colspan=1 rowspan=1 > 1,433 </td><td colspan=1 rowspan=1 > 3.1 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 70.6 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Labour gain from Conservative </td><th class="highlighted"  colspan=1 rowspan=1 > Swing </th><td class="highlighted"  colspan=1 rowspan=1 > +17.4 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What did Portillo's defeat mean for the Labour party?
Answer:
Portillo's defeat represented a 17.4% swing to Labour.