<P> In 1982 access was further restricted by railings and a demountable gate . They were replaced by black steel gates in 1989 . The increase in security was due to an increase in violence , particularly by the IRA during The Troubles . The Thatcher ministry was particularly moved to increase security after the 1979 assassination of Lord Mountbatten . </P>
<P> In 1982 access was further restricted by railings and a demountable gate . They were replaced by black steel gates in 1989 . The increase in security was due to an increase in violence , particularly by the IRA during The Troubles . The Thatcher ministry was particularly moved to increase security after the 1979 assassination of Lord Mountbatten . </P>
when did they put gates on downing street
when did they put gates on downing street
1989
1989