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:
List of My Family episodes
Table title:
Series 8 (2008)
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > # </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Directed by </th><th colspan=1 rowspan=1 > Written by </th><th colspan=1 rowspan=1 > Original airdate </th><th colspan=1 rowspan=1 > Duration </th><th colspan=1 rowspan=1 > Viewership </th></tr>
<tr> <td colspan=13 rowspan=1 > Series </td></tr>
<tr> <th colspan=1 rowspan=1 > 84 </th><td colspan=1 rowspan=1 > "The Parent Trap" </td><td colspan=1 rowspan=1 > Baz Taylor </td><td colspan=1 rowspan=1 > Brian Leveson and Paul Minett </td><td class="highlighted"  colspan=1 rowspan=1 > 11 April 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 5.56 million </td></tr>
<tr> <td class="highlighted"  colspan=7 rowspan=1 > Ben is delighted when he takes delivery of a plasma television for his neighbour Mr MacIntyre, who is on holiday. Michael tells his parents that Nikki (Ellie Beaven), his girlfriend, is pregnant. </td></tr>
<tr> <th colspan=1 rowspan=1 > 85 </th><td colspan=1 rowspan=1 > "Let's Not Be Heisty" </td><td colspan=1 rowspan=1 > Baz Taylor </td><td colspan=1 rowspan=1 > Ed Dyson </td><td colspan=1 rowspan=1 > 18 April 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 5.43 million </td></tr>
<tr> <td colspan=7 rowspan=1 > When Ben goes to his bank to pay in a cheque from Alfie for two years' rent, he walks in during a robbery. </td></tr>
<tr> <th colspan=1 rowspan=1 > 86 </th><td colspan=1 rowspan=1 > "Cards on the Table" </td><td colspan=1 rowspan=1 > Baz Taylor </td><td colspan=1 rowspan=1 > Brian Leveson and Paul Minett </td><td colspan=1 rowspan=1 > 25 April 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 5.23 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Ben becomes addicted to poker while Susan has become addicted to seeing clairvoyant Zelda Nobbs (Anna Chancellor). Zelda tells Susan that Ben will die the following Thursday at 9.04 pm. </td></tr>
<tr> <th colspan=1 rowspan=1 > 87 </th><td colspan=1 rowspan=1 > "The Wax Job" </td><td colspan=1 rowspan=1 > Baz Taylor </td><td colspan=1 rowspan=1 > Steve Armogida and Jim Armogida </td><td colspan=1 rowspan=1 > 2 May 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 5.13 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Susan is made the manager of the art gallery, and immediately has to prepare for a new exhibition. Meanwhile, Ben retires when he sells out to the Cavatex Corporation, which has become Roger's employer. </td></tr>
<tr> <th colspan=1 rowspan=1 > 88 </th><td colspan=1 rowspan=1 > "Neighbour Wars" </td><td colspan=1 rowspan=1 > Baz Taylor </td><td colspan=1 rowspan=1 > Darin Henry </td><td colspan=1 rowspan=1 > 9 May 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 5.02 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Ben accidentally drives into Mr Casey (Nickolas Grace), the neighbour whose dog he previously ran over, and he ends up in hospital. </td></tr>
<tr> <th colspan=1 rowspan=1 > 89 </th><td colspan=1 rowspan=1 > "Can't Get No Satisfaction" </td><td colspan=1 rowspan=1 > Nic Phillips </td><td colspan=1 rowspan=1 > David Cantor </td><td colspan=1 rowspan=1 > 16 May 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 4.89 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Kenzo is learning the piano, much to the family's disappointment. Ben reforms the rock and roll band he was with in his 20s, The Revolutions, and makes contact with guitarists Ziggy (Philip Bird) and Danny (David Keyes) and drummer Sticks (Rowland Rivron). </td></tr>
<tr> <th colspan=1 rowspan=1 > 90 </th><td colspan=1 rowspan=1 > "The Abi Habit" </td><td colspan=1 rowspan=1 > Nic Phillips </td><td colspan=1 rowspan=1 > Tom Anderson </td><td colspan=1 rowspan=1 > 23 May 2008 </td><td colspan=1 rowspan=1 > 30 minutes </td><td colspan=1 rowspan=1 > 4.74 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Having not had sex for several weeks, Susan decides that to spice up their sex lives they should abstain from sex and even the slightest physical contact for three weeks. </td></tr>
<tr> <td colspan=13 rowspan=1 > Special </td></tr>
<tr> <th colspan=1 rowspan=1 > 91 </th><td colspan=1 rowspan=1 > "Have An Unhappy Christmas" </td><td colspan=1 rowspan=1 > Nic Phillips </td><td colspan=1 rowspan=1 > Brian Leveson and Paul Minett </td><td colspan=1 rowspan=1 > 24 December 2008 </td><td colspan=1 rowspan=1 > 60 minutes </td><td colspan=1 rowspan=1 > 7.12 million </td></tr>
<tr> <td colspan=7 rowspan=1 > Ben buys Susan a vacuum cleaner but soon regrets it, so he goes out to buy a necklace but is horrified to find it half price in a sale the next day. </td></tr>
</table>
Question:
Who did Ellie Beaven play in the episode of the eighth series of My Family on 11 April 2008?
Answer:
On 11 April 2008, Ellie Beaven played Nikki, girlfriend to Michael, in the opening episode of the eighth series of My Family.