Sir Denis Thatcher , 1st Baronet , ( 10 May 1915 -- 26 June 2003 ) was a British businessman , and the husband of the former British Prime Minister Margaret Thatcher .
Major Sir Denis Thatcher , 1st Baronet , MBE , ( 10 May 1915 -- 26 June 2003 ) was a British businessman , and the husband of the former British Prime Minister Margaret Thatcher .