"Hopes of a counterbid for Mitchells & Butlers were stirred up after the Martini family was revealed to have been building a stake in the pubs company. Regulatory filings showed that the Italian family's Unigra International had taken control of 7m shares, worth 1.74pc of the company. In its latest disclosed transaction, it bought the equivalent of 50,000 shares at 460p, through derivatives called contracts for difference."
http://www.telegraph.co.uk/money/main.jhtml?xml=/money/2008/02/07/cxmktrep107.xml