<Li> Jo Herbert as Emma Finch </Li> <Li> Ash Rizi as Dr. Walsh </Li> <Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Avg UK viewership (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"> 8 October 2015 (2015 - 10 - 08) </Td> <Td> 12 November 2015 (2015 - 11 - 12) </Td> <Td> 6.44 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 5 January 2017 (2017 - 01 - 05) </Td> <Td> 9 February 2017 (2017 - 02 - 09) </Td> <Td> 6.91 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 15 July 2018 (2018 - 07 - 15) </Td> <Td> 19 August 2018 (2018 - 08 - 19) </Td> <Td> TBA </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th> Avg UK viewership (millions) </Th> </Tr>

How many episodes in the unforgotten season 2