Finalco Group Inc., the McLean-based equipment leasing company, has announced the appointment of a new management team for its principal subsidiary, Finalco Inc. Executive vice president Terry J. Billingsley, who has been with the firm for six years in various marketing capacities, was promoted to chairman of the board. Paul M. Finfer, previously chairman of Diversified Commercial Services Corp., was named president and chief operating officer of Finalco Inc., and executive vice president of the parent firm. And Edward J. Larese, a former vice president and controller for Eastern Airlines Inc., was elected executive vice president and chief financial officer.

Riggs National Bank has named David F. Collins, who recently was elected senior vice president, as general manager of the bank's London branch. He succeeds executive vice president George P. Clancy, who will return to Washington to assume new responsibilities. In addition, Melville C. D. Goodchild, a vice president, was appointed deputy manager of the London branch.

The Washington investment firm of Ferris & Co. Inc. has elected Edwin K. Hoffman, chairman and chief executive officer of Woodward & Lothrop Inc., to its advisory board.

National Bank of Commerce has appointed John C. York Jr. to its board of directors. York is chairman and president of York Associates Inc., a privately held real estate firm.

Laidlaw Ansbacher Inc., a New York investment banking firm, has named John Linnehan vice president and manager of the company's Washington office. He was an account executive in the Connecticut Avenue office of Merrill Lynch, Pierce, Fenner and Smith.