The market celebrated Ocado's news of a potential partnership with Morrison. Richard Curr from Prime Markets said that the deal could be a 'game changer' for the firm. The online grocer also revealed 14.4 per cent rise in first-quarter sales in a separate statement. After signalling higher-than-expected full-year profits earlier in the year, Home Retail, the owner of Argos and Homebase, further raised its guidance this morning after reporting a strong end to its financial year, causing shares to surge. Wholesale group Booker was also a high riser after the Competition Commission provisionally approved its acquisition of fellow cash-and-carry chain Makro. Hochschild Mining was lower after JP Morgan cut its target price from 450p to 365p, while its neutral rating remained unchanged. FTSE 250 - RisersOcado Group (OCDO) 169.00p +23.00%Home Retail Group (HOME) 148.50p +11.74%Kentz Corporation Ltd. (KENZ) 410.00p +8.47%Booker Group (BOK) 124.90p +7.67%Savills (SVS) 591.00p +6.39%Playtech Ltd. (PTEC) 610.50p +6.17%COLT Group SA (COLT) 129.20p +5.90%St. Modwen Properties (SMP) 265.00p +5.45%Ophir Energy (OPHR) 447.40p +5.02%Perform Group (PER) 459.00p +4.56%FTSE 250 - FallersHochschild Mining (HOC) 300.00p -5.51%Homeserve (HSV) 222.70p -4.54%Ferrexpo (FXPO) 196.00p -3.69%Kenmare Resources (KMR) 32.37p -2.53%Balfour Beatty (BBY) 264.40p -1.97%F&C Asset Management (FCAM) 107.40p -1.83%Henderson Group (HGG) 168.00p -1.70%Lonmin (LMI) 324.60p -1.70%Senior (SNR) 241.70p -1.63%Workspace Group (WKP) 341.90p -1.61%NR