<P> New Tricks is a British police procedural comedy - drama which follows the fictional Unsolved Crime and Open Case Squad (UCOS) of the Metropolitan Police Service . The show was created by Roy Mitchell and Nigel McCrery, and premiered in 2003 with a 90 - minute special, which later resulted in the show's first full series airing . New Tricks ran for twelve series--from 2003 until 2015--concluding on 6 October 2015 . BBC controller Charlotte Moore and BBC drama controller Ben Stephenson explained the reason behind the show's cancellation on 24 February 2015, stating that "it's important to make room for new series and continue to increase the range of drama on the channel". </P> <P> The original cast of New Tricks consisted of Amanda Redman, Dennis Waterman, James Bolam and Alun Armstrong, and were branded a "dream team" by the Controller of BBC's Drama Commissioning Ben Stephenson, however on 18 September 2011, Bolam announced he would be leaving the show . Almost three months later, on 11 January 2012, Denis Lawson was revealed as Bolam's replacement . Then, on 18 August 2012, Redman announced she would also be leaving the show in order to "try something new". Just four days later, on 22 August 2012, Armstrong also quit the show . Replacements for Redman and Armstrong included former EastEnders actress Tamsin Outhwaite, who was announced on 8 May 2013, and Nicholas Lyndhurst, whose replacement casting was announced earlier, on 14 November 2012 . The show's final remaining original cast member, Waterman, decided to quit the show on 19 September 2014 . Following Waterman's departure, former EastEnders actor Larry Lamb joined the cast . </P> <Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Average viewers (in millions) </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> Pilot </Td> <Td_colspan="2"> </Td> <Td_colspan="2"> 23 March 2003 (2003 - 03 - 23) </Td> <Td> 6.69 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 1 April 2004 (2004 - 04 - 01) </Td> <Td> 6 May 2004 (2004 - 05 - 06) </Td> <Td> 6.95 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 9 May 2005 (2005 - 05 - 09) </Td> <Td> 27 June 2005 (2005 - 06 - 27) </Td> <Td> 7.48 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 17 April 2006 (2006 - 04 - 17) </Td> <Td> 5 June 2006 (2006 - 06 - 05) </Td> <Td> 8.00 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 9 April 2007 (2007 - 04 - 09) </Td> <Td> 28 May 2007 (2007 - 05 - 28) </Td> <Td> 8.25 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 7 July 2008 (2008 - 07 - 07) </Td> <Td> 25 August 2008 (2008 - 08 - 25) </Td> <Td> 8.83 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 16 July 2009 (2009 - 07 - 16) </Td> <Td> 3 September 2009 (2009 - 09 - 03) </Td> <Td> 7.94 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 10 September 2010 (2010 - 09 - 10) </Td> <Td> 12 November 2010 (2010 - 11 - 12) </Td> <Td> 7.85 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 4 July 2011 (2011 - 07 - 04) </Td> <Td> 5 September 2011 (2011 - 09 - 05) </Td> <Td> 9.24 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 9 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 27 August 2012 (2012 - 08 - 27) </Td> <Td> 29 October 2012 (2012 - 10 - 29) </Td> <Td> 8.35 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 10 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 30 July 2013 (2013 - 07 - 30) </Td> <Td> 1 October 2013 (2013 - 10 - 01) </Td> <Td> 8.14 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 11 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 18 August 2014 (2014 - 08 - 18) </Td> <Td> 20 October 2014 (2014 - 10 - 20) </Td> <Td> 5.76 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 12 </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 4 August 2015 (2015 - 08 - 04) </Td> <Td> 6 October 2015 (2015 - 10 - 06) </Td> <Td> 6.28 </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Average viewers (in millions) </Th> </Tr>

How many series of new tricks are there
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