M&A watchers have been kept busy over the last five days. Wal-Mart made a move into South Africa and Unilever expanded in Greece (and signalled it may sell two UK brands). Meanwhile, speculation over Yoplait and United Biscuits rumbled on and Dairy Crest was the subject of takeover rumours, too. Elsewhere, US food group Campbell Soup Co. and Dutch retailer Ahold announced changes at the top. These were our highlights this week.