Scottish dairy group Robert Wiseman is the best performer after sales and turnover beat forecasts. Overall milk sales volumes are up over 10% on last year, thanks to an increase in supplies to the Co-operative Group in June following the collapse of Dairy Farmers of Britain.The company's share of Tesco's total fresh milk is in line with forecasts, while an extra 137 Sainsbury 'Local' stores began taking the firm's milk in April.Investors rushed to buy shares in Grainger as the residential property group boosted its liquidity position after agreeing new banking facilities.Oil stocks such as Dana Petroleum, Salamander Energy and JKX Oil and Gas are hit by lower crude prices.FTSE 250 - RisersRobert Wiseman (RWD) 445.00p +5.80%St James's Place (STJ) 272.00p +4.33%Halma (HLMA) 226.00p +4.15%Croda International (CRDA) 682.50p +4.04%Enterprise Inns (ETI) 129.50p +4.02%Grainger (GRI) 307.20p +3.23%Greene King (GNK) 435.00p +3.20%Morgan Crucible (MGCR) 177.30p +3.14%Derwent London (DLN) 1,255.00p +2.87%Forth Ports (FPT) 1,241.00p +2.73%FTSE 250 - FallersMisys (MSY) 200.00p -3.19%Dana Petroleum (DNX) 1,360.00p -3.00%Trinity Mirror (TNI) 166.80p -2.91%SSL International (SSL) 622.50p -2.73%JPMorgan Japanese Inv Trust (JFJ) 152.80p -2.68%Mondi (MNDI) 301.00p -2.56%Electrocomponents (ECM) 149.80p -2.47%Salamander Energy (SMDR) 220.00p -2.44%JKX Oil & Gas (JKX) 271.80p -2.12%Hays (HAS) 101.90p -2.02%