Continental Illinois, reponding to an SEC complaint, said it would change its financial records covering more than $425 million in bad loans in 1984. . . . The London Stock Exchange will close its trading floor for equities and government bonds, ending almost three centuries of face-to-face dealing. . . . Renouf Corp. International announced that it is proceeding with its offer for all outstanding units of Benequity Holdings at $31 per unit in cash. . . . Whittaker Corp. said it agreed to sell its Juster Steel division for an undisclosed amount to a group headed by Juster's senior management.