Friday broker round-up - UPDATE

Shanks Group: Goldman Sachs downgrades to neutral from buy.Man Group: Deutsche Bank downgrades to sell from buy.BSkyB: Bank of America-Merrill Lynch downgrades to neutral from buy, cuts target to 770p from 800p. Carnival: HSBC upgrades to overweight from neutral.BP: Evolution Securities reiterates buy and 510p target.Kazakhmys: Evolution Securities keeps add rating and 1,260p target.Drax: Nomura reiterates reduce rating and 485p target; Credit Suisse raises target from 350p to 440p, keeps underperform rating.Tate & Lyle: Investec keeps sell rating and 610p target.Premier Foods: Investec keeps buy rating and 15p target.Punch Taverns: Charles Stanley keeps hold rating.Zanaga Iron Ore: Investec maintains buy and 141p target. BP Man Tate & Lyle Premier Foods Drax