Carrefour talk boosts shares Marks and Spencer's shares soared this week on rumours it was being stalked by French retailer Carrefour. They jumped 32.5p to 261.5p in a day, before settling back to 241.75p. Analysts said the fact M&S had seen its shares soar by so much indicated the City was taking rumours of buyout talks seriously. Carrefour, however, has publicly denied any talks with Marks and Spencer, which refused to comment. M&S this week welcomed ex-Promodès chairman Luc Vandevelde to his new job as executive chairman. Those backing the rumours point out Vandevelde is on good terms with Carrefour's bosses. {{NEWS }}