<Table> <Tr> <Th_colspan="2"> Detectorists </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Comedy </Td> </Tr> <Tr> <Th> Written by </Th> <Td> Mackenzie Crook </Td> </Tr> <Tr> <Th> Directed by </Th> <Td> Mackenzie Crook </Td> </Tr> <Tr> <Th> Starring </Th> <Td> Mackenzie Crook Toby Jones </Td> </Tr> <Tr> <Th> Opening theme </Th> <Td> "Detectorists" by Johnny Flynn </Td> </Tr> <Tr> <Th> Composer (s) </Th> <Td> Johnny Flynn </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> 19 </Td> </Tr> <Tr> <Th_colspan="2"> Production </Th> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Adam Tandy </Td> </Tr> <Tr> <Th> Cinematography </Th> <Td> Jamie Cairney </Td> </Tr> <Tr> <Th> Running time </Th> <Td> 29 minutes </Td> </Tr> <Tr> <Th> Production company (s) </Th> <Td> <Ul> <Li> Channel X </Li> <Li> Lola Entertainment </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> <Ul> <Li> BBC Four </Li> <Li> BBC Four HD </Li> </Ul> </Td> </Tr> <Tr> <Th> Picture format </Th> <Td> 16: 9 1080i </Td> </Tr> <Tr> <Th> Audio format </Th> <Td> Stereo </Td> </Tr> <Tr> <Th> Original release </Th> <Td> 2 October 2014 (2014 - 10 - 02)--13 December 2017 (2017 - 12 - 13) </Td> </Tr> <Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Th> Website </Th> <Td> www.bbc.co.uk/programmes/b06l51nr </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Detectorists </Th> </Tr>

How many series of the detectorists are there
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