<Tr> <Td> Norfolk Constabulary </Td> <Td> Simon Bailey, QPM </Td> <Td> 25 October 2013 </Td> </Tr> <Tr> <Td> North Wales Police </Td> <Td> Mark Polin </Td> <Td> 10 September 2009 </Td> </Tr> <Tr> <Td> Northamptonshire Police </Td> <Td> Simon Edens </Td> <Td> July 2015 </Td> </Tr> <Tr> <Td> Northumbria Police </Td> <Td> Steve Ashman </Td> <Td> June 2015 </Td> </Tr>

What is the role of a chief constable