<Li> ^ Ant & Dec served as guest judges in the eighth series, substituting for Cowell on the first day of the Manchester auditions . </Li> <Li> ^ David Walliams' mother, Kathleen Williams, served as a guest judge in place of Cowell, while attending a session in the tenth series . </Li> <Table> <Tr> <Th> Series </Th> <Th> Start </Th> <Th> Finish </Th> <Th> Winner's prize </Th> <Th> Winner </Th> <Th> Runner - up </Th> <Th> Third place </Th> <Th> Ave . UK viewers (millions) </Th> </Tr> <Tr> <Th> </Th> <Td> 9 June 2007 </Td> <Td> 17 June 2007 </Td> <Td> £ 100,000 </Td> <Td> Paul Potts </Td> <Td_colspan="2"> N / A </Td> <Td> 8.38 </Td> </Tr> <Tr> <Th> </Th> <Td> 12 April 2008 </Td> <Td> 31 May 2008 </Td> <Td> George Sampson </Td> <Td> Signature </Td> <Td> Andrew Johnston </Td> <Td> 10.21 </Td> </Tr> <Tr> <Th> </Th> <Td> 11 April 2009 </Td> <Td> 30 May 2009 </Td> <Td> Diversity </Td> <Td> Susan Boyle </Td> <Td> Julian Smith </Td> <Td> 13.36 </Td> </Tr> <Tr> <Th> </Th> <Td> 17 April 2010 </Td> <Td> 5 June 2010 </Td> <Td> Spelbound </Td> <Td> Twist and Pulse </Td> <Td> Kieran Gaffney </Td> <Td> 11.05 </Td> </Tr> <Tr> <Th> 5 </Th> <Td> 16 April 2011 </Td> <Td> 4 June 2011 </Td> <Td> Jai McDowall </Td> <Td> Ronan Parke </Td> <Td> New Bounce </Td> <Td> 10.40 </Td> </Tr> <Tr> <Th> 6 </Th> <Td> 24 March 2012 </Td> <Td> 12 May 2012 </Td> <Td> £ 500,000 </Td> <Td> Ashleigh and Pudsey </Td> <Td> Jonathan and Charlotte </Td> <Td> Only Boys Aloud </Td> <Td> 10.07 </Td> </Tr> <Tr> <Th> 7 </Th> <Td> 13 April 2013 </Td> <Td> 8 June 2013 </Td> <Td> £ 250,000 </Td> <Td> Attraction </Td> <Td> Jack Carroll </Td> <Td> Richard & Adam </Td> <Td> 9.71 </Td> </Tr> <Tr> <Th> 8 </Th> <Td> 12 April 2014 </Td> <Td> 7 June 2014 </Td> <Td> Collabro </Td> <Td> Lucy Kay </Td> <Td> Bars & Melody </Td> <Td> 9.84 </Td> </Tr> <Tr> <Th> 9 </Th> <Td> 11 April 2015 </Td> <Td> 31 May 2015 </Td> <Td> Jules O'Dwyer & Matisse </Td> <Td> Jamie Raven </Td> <Td> Côr Glanaethwy </Td> <Td> 9.31 </Td> </Tr> <Tr> <Th> 10 </Th> <Td> 9 April 2016 </Td> <Td> 28 May 2016 </Td> <Td> Richard Jones </Td> <Td> Wayne Woodward </Td> <Td> Boogie Storm </Td> <Td> 9.43 </Td> </Tr> <Tr> <Th> 11 </Th> <Td> 15 April 2017 </Td> <Td> 3 June 2017 </Td> <Td> Tokio Myers </Td> <Td> Issy Simpson </Td> <Td> Daliso Chaponda </Td> <Td> 9.12 </Td> </Tr> <Tr> <Th> 12 </Th> <Td> 14 April 2018 </Td> <Td> 3 June 2018 </Td> <Td> Lost Voice Guy </Td> <Td> Robert White </Td> <Td> Donchez Dacres </Td> <Td> 8.33 </Td> </Tr> </Table> <Tr> <Th> Series </Th> <Th> Start </Th> <Th> Finish </Th> <Th> Winner's prize </Th> <Th> Winner </Th> <Th> Runner - up </Th> <Th> Third place </Th> <Th> Ave . UK viewers (millions) </Th> </Tr>

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