In 1989 , the location changed to Merton , South London , a production base they used till the series ended .
During March 1987 , filming for the third series went ahead in Ladbroke Grove , west London .
In 1989 , the location changed to Merton , London   , a production base they used till the series ended .
During March 1987 , filming for the third series went ahead in Ladbroke Grove , west London .