Thursday broker round-up UPDATE

AMEC: Berenberg initiates with a target price of 1450p and a buy recommendation.Imagination Technology: UBS ups target price from 200p to 250p and maintains a buy recommendation.IMI: UBS raises target price from 1600p to 1700p upgrading from neutral to buy.John Wood Group: Berenberg initiates with a target price of 714p and a hold recommendation.Ophir Energy: UBS lowers target price from 285p to 280p retaining its buy recommendation.QinetiQ: UBS cuts target price from 235p to 215p maintaining a neutral rating.Renishaw: Investec reduces target price from 1940p to 1780p retaining a hold recommendation.Sabien Technology Group: UBS lowers target price from 60p to 50p and keeps a buy recommendation.Talk Talk Telecom: UBS increases target price from 235p to 310p and upgrades from sell to neutral.Tekcapital: Northland Capital initiates with a target price of 45p and a buy recommendation.WPP Group: Investec raises target price from 1350p to 1420p and upgrades from add to buy. Renishaw WPP TekCapital IMI Sabien Tech.