<Table> Britain in the Second World War <Tr> <Td_colspan="2"> 1939--1945 </Td> </Tr> <Tr> <Td_colspan="2"> British Second World War propaganda poster </Td> </Tr> <Tr> <Th> Preceded by </Th> <Td> Interwar Britain </Td> </Tr> <Tr> <Th> Followed by </Th> <Td> Post-war Britain </Td> </Tr> <Tr> <Th> Monarch (s) </Th> <Td> George VI </Td> </Tr> <Tr> <Th> Leader (s) </Th> <Td> <Ul> <Li> Neville Chamberlain </Li> <Li> Winston Churchill </Li> </Ul> </Td> </Tr> </Table> <Tr> <Td_colspan="2"> 1939--1945 </Td> </Tr> <Tr> <Td_colspan="2"> British Second World War propaganda poster </Td> </Tr>

When did great britain enter world war ii