This spring takeover spree has thrust no fewer than five Footsie companies - Innogy, Powergen, P&O Princess, Imperial Tobacco and Enterprise - into the bid limelight. A flutter of smaller deals involving Enterprise Inns, Thistle Hotels, Amersham, JJB Sports, Johnston Press, Haslemere Estates, Queens Moat Houses and Sytner has swollen the grand total to more than £25bn.