<Tr> <Td_colspan="2"> Royal coat of arms </Td> </Tr> <Tr> <Th_colspan="2"> Incumbent </Th> </Tr> <Tr> <Td_colspan="2"> Elizabeth II since 6 February 1952 (1952 - 02 - 06) </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr>

When did the monarchy lose power in britain