<Table> <Tr> <Th_colspan="2"> The Bletchley Circle </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Written by </Th> <Td> Guy Burt </Td> </Tr> <Tr> <Th> Directed by </Th> <Td> Andy De Emmony Jamie Payne Sarah Harding </Td> </Tr> <Tr> <Th> Starring </Th> <Td> <Ul> <Li> Anna Maxwell Martin </Li> <Li> Rachael Stirling </Li> <Li> Sophie Rundle </Li> <Li> Julie Graham </Li> <Li> Hattie Morahan </Li> </Ul> </Td> </Tr> <Tr> <Th> Composer (s) </Th> <Td> Nick Green </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United Kingdom </Td> </Tr> <Tr> <Th> Original language (s) </Th> <Td> English </Td> </Tr> <Tr> <Th> No. of series </Th> <Td> </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 7 (list of episodes) </Td> </Tr> <Tr> <Th_colspan="2"> Production </Th> </Tr> <Tr> <Th> Executive producer (s) </Th> <Td> Simon Heath </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Jake Lushington </Td> </Tr> <Tr> <Th> Cinematography </Th> <Td> John Pardue </Td> </Tr> <Tr> <Th> Running time </Th> <Td> 45 minutes </Td> </Tr> <Tr> <Th> Production company (s) </Th> <Td> World Productions </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> ITV </Td> </Tr> <Tr> <Th> Original release </Th> <Td> 6 September 2012 (2012 - 09 - 06)--27 January 2014 (2014 - 01 - 27) </Td> </Tr> <Tr> <Th_colspan="2"> Chronology </Th> </Tr> <Tr> <Th> Followed by </Th> <Td> The Bletchley Circle: San Francisco </Td> </Tr> </Table> <Tr> <Th_colspan="2"> The Bletchley Circle </Th> </Tr>

How many episodes of the bletchley circle are there