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:
2015 Colchester Borough Council election
Table title:
By-elections since the previous election
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 class="highlighted"  colspan=1 rowspan=1 > Labour </td><td class="highlighted"  colspan=1 rowspan=1 > Rosalind Scott </td><td colspan=1 rowspan=1 > 857 </td><td colspan=1 rowspan=1 > 46.7 </td><td colspan=1 rowspan=1 > 5.4 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Conservative </td><td colspan=1 rowspan=1 > Peter Hill </td><td colspan=1 rowspan=1 > 629 </td><td colspan=1 rowspan=1 > 34.3 </td><td colspan=1 rowspan=1 > +2.4 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > UKIP </td><td colspan=1 rowspan=1 > John Pitts </td><td colspan=1 rowspan=1 > 129 </td><td colspan=1 rowspan=1 > 7.0 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Liberal Democrat </td><td colspan=1 rowspan=1 > Shaun Boughton </td><td colspan=1 rowspan=1 > 127 </td><td colspan=1 rowspan=1 > 6.9 </td><td colspan=1 rowspan=1 > 0.1 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Green </td><td colspan=1 rowspan=1 > Tim Glover </td><td colspan=1 rowspan=1 > 90 </td><td colspan=1 rowspan=1 > 4.9 </td><td colspan=1 rowspan=1 > 4.2 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Patriotic Socialist </td><td colspan=1 rowspan=1 > Dave Osborn </td><td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 0.1 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td class="highlighted"  colspan=1 rowspan=1 > 228 </td><td colspan=1 rowspan=1 > 12.4 </td><td colspan=1 rowspan=1 > 7.9 </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 > 1,834 </td><td colspan=1 rowspan=1 > 43 </td><td colspan=1 rowspan=1 > +1 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Labour hold </td><th colspan=1 rowspan=1 > Swing </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What year's Colchester Borough Council election was the seat was held for Labour by Rosalind Scott with a majority of 228 votes over the Conservatives?
Answer:
In the 2015 Colchester Borough Council election, the seat was held for Labour by Rosalind Scott with a majority of 228 votes over the Conservatives.