<Li> Jenson Clarke as Charles Shelby (series 4): son of Tommy Shelby and Grace Burgess </Li> <Li> Ethan Picard - Edwards as Billy Shelby (series 4): son of Arthur Shelby, Jr. and Linda Shelby </Li> <Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Average UK viewers (millions) </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 12 September 2013 (2013 - 09 - 12) </Td> <Td> 17 October 2013 (2013 - 10 - 17) </Td> <Td> 2.38 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 2 October 2014 (2014 - 10 - 02) </Td> <Td> 6 November 2014 (2014 - 11 - 06) </Td> <Td> 2.18 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 5 May 2016 (2016 - 05 - 05) </Td> <Td> 9 June 2016 (2016 - 06 - 09) </Td> <Td> 2.38 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 15 November 2017 (2017 - 11 - 15) </Td> <Td> 20 December 2017 (2017 - 12 - 20) </Td> <Td> 4.05 </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Average UK viewers (millions) </Th> </Tr>

How many episodes in praky blinders season 4