Thursday broker round-up UPDATE

African Minerals: Deutsche Bank reduces target price from 594p to 586p keeping a buy recommendation. Investec cuts target price from 438p to 411p, while its buy recommendation remains unchanged.Associated British Foods: Societe Generale increases target price from 1820p to 1900p, while downgrading to hold.AZ Electronic Materials: Societe Generale takes target price from 425p to 350p, while staying with its buy recommendation. N+1 Singer reduces target price from 420p to 320p, while upgrading to buy.Balfour Beatty: Berenberg upgrades from hold to buy with a target price of 290p.Centamin: Societe Generale lowers target price from 55p to 40p and downgrades to sell.Diageo: Goldman Sachs raises target price from 2220p to 2730p and stays with its buy recommendation.Eurasian Natural Resources: Exane BNP reduces target price from 340p to 270p maintaining a neutral rating.Fresnillo: Societe Generale moves target price from 1200p to 1150p and keeps a sell recommendation.Kazakhmys: Exane BNP cuts target price from 500p to 350p and reiterates an underperform rating.Mar City: WH Ireland initiates with a target price of 5.5p and a buy recommendation.Marks & Spencer: Investec places its target price (prev.: 275p) under review and reiterates a sell recommendation.Northbridge: WH Ireland ups target price from 350p to 370p and keeps its buy recommendation. Westhouse Securities raises target price from 350p to 400p retaining a buy rating.Petropavlovsk: Societe Generale reduces target price from 470p to 275p, while maintaining its buy recommendation.PZ Cussions: Canaccord Genuity ups target price from 319p to 332p, but still recommends selling. Randgold Resources: Societe generale cuts target price from 8000p to 6500p, while leaving its buy recommendation unchanged.Spirent Communications: Canaccord Genuity reduces target price from 156p to 135p reiterating a hold recommendation.UBM: Westhouse Securities upgrades from add to buy with a target price of 829p.Vedanta Resources: Deutsche Bank lowers target price from 1270p to 1230p, while its buy recommendation remains unchanged.Volex: Investec shifts target price from 95p to 105p keeping a hold recommendation.Xaar: Investec ups target price from 430p to 490p and maintains a buy recommendation.