A third Kingfisher executive is leaving the nest to join former colleagues at embattled M&S a report in the Daily Telegraph said today. And Nigel Whinnett, head of menswear, is quitting the company after a period of extended leave. Barry Stevenson, former managing director of B&Q Supercentres, is to take over the retail directorship from Richard Woolf, an M&S veteran who is going to Harvard University for a "management development" course before returning to the company.