Thursday broker round-up

African Barrick Gold: Goldman Sachs upgrades from sell to neutral.Amlin: Nomura maintains neutral rating and 383p target.Aviva: Shore Capital downgrades from buy to hold; Nomura keeps buy rating and 600p target.Babcock: Liberum Capital downgrades from buy to hold.Brammer: Westhouse Securities downgrades from buy to neutral.Compass: Jefferies raises target from 515p to 540p, outperform rating kept.HSBC: Investec upgrades from holdto buy.ICAP: UBS upgrades from sell to neutral, target lifted raised from 310p to 330p.Lamprell: Oriel Securities downgrades from buy to hold; JP Morgan Cazenove downgrades from overweight to neutral, target slashed from 470p to 266p.TalkTalk: Jefferies reiterates buy recommendation and 166p target; Nomrua keeps buy stance and 180p target.Tullett Prebon: UBS upgrades from sell to neutral, target upped from 275p to 290p.Xchanging: JP Morgan Cazenove downgrades from overweight to neutral, target raised from 106p to 108p.BC Babcock Aviva HSBC Holdings Compass Group Aston Martin Lagonda