Friday broker round-up

African Minerals: Jefferies cuts target from 800p to 550p, buy rating kept.Anglo American: Jefferies downgrades from buy to hold, 2,200p target kept.Ashmore: Citigroup downgrades to sell, target cut from 305p to 300p.Berendsen: Investec maintains buy rating and 570p target; Seymour Pierce downgrades to add.Borders & Southern: Merchant Securities reinstates buy rating and 65.1p target.Carillion: UBS raises tagged from 230p to 240p, sell rating unchanged.Clarkson: Oriel Securities downgrades to hold.Diageo: Nomura raises target from 1,840p to 2,000p, buy rating unchanged.Henry Boot: Investec cuts target from 185p to 160p, buy rating kept.London Mining: Jefferies cuts target from 590p to 430p, buy rating kept.National Grid: Nomura ups target from 730p to 735p, buy rating kept.Severn Trent: Goldman Sachs upgrades to neutral.Stobart Group: Investec cuts target from 165p to 135p, resumes coverage with buy rating.WH Smith: Investec raises target from 615p to 690p, buy rating maintained.WPP: Investec keeps buy rating and 860p target.Xstrata: AlphaValue downgrades from add to reduce.BC Anglo American National Grid Wh Smith Carillion Plc Diageo Ashmore Group WPP Severn Trent Borders & Sth. Clarkson