LONDON, May 21 (Reuters) - The chief executive of Marks & Spencer said on Wednesday he could not comment on whether the retailer had paid a ransom in a cyber attack which has cost it about 300 million pounds ($402.39 million) and which he said was the result of "human error". ($1 = 0.7455 pounds) (Reporting by James Davey and Paul Sandle, writing by Sarah Young, editing by Catarina Demony)

IN BRIEF: J Sainsbury adds Sage CEO and former M&S co-CEO to board
J Sainsbury PLC - London-based supermarket chain - Names Steve Hare, the chief executive officer of accounting software firm Sage Group PLC, and Katie Bickerstaffe, the former co-CEO of retailer Marks & Spencer Group PLC, as new non-executive directors, both joining at the Sainsbury's annual general meeting in July. In addition to M&S, Bickerstaffe has held senior positions at electricity supplier SSE PLC, electrical goods retailer Dixons Carphone and electrical goods maker Dyson, and consumer goods firms Pepsico Inc and Unilever PLC. She currently is a non-executive director of housebuilder Barratt Redrow PLC, investment manager Aberdeen Group PLC, and technical products distributor Diploma PLC, where she is senior independent director.
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