Tesco: ING downgrades to sell from buy. Marks&Spencer: ING downgrades to sell from hold.Morrison: ING upgrades from hold to buy.Rio Tinto: Credit Suisse reiterates outperform recommendation and 5,000p target.London Stock Exchange: Credit Suisse upgrades from underperform to neutral, 850p target price kept.Thomas Cook: Credit Suisse cuts target from 100p to 40p, outperform rating maintained; Evolution Securities keeps neutral rating and 35p target.BG Group: Nomura keeps buy rating and 1,850p target; Evolution Securities keeps buy rating and 1,800p target.Centrica: Investec reiterates buy rating and 423p target.Cookson: Evolution Securities maintains buy and 780p target.TUI Travel: Evolution Securities maintains sell recommendation and 150p target.Logica: Investec maintains hold, 85p target under review; Evolution Securities pus rating and target price under review.Go-Ahead: UBS raises target from 1,200p to 1,210p, sell rating unchanged.Betfair: Evolution Securities retains neutral stance and 950p target.Monitise: Evolution Securities keeps buy and 45p target.IG Group: UBS ups target from 510p to 555p, buy rating kept.Travis Perkins: UBS cuts target from 960p to 940p, buy rating unchanged.RWS Holdings: Numis Securities raises target from 484p to 536p, add recommendation kept.IDOX: Investec keeps buy recommendation and 32p target.Lochard Energy: Merchant Securities gives buy rating and 24.2p target.