India-focused energy firm Essar gained after saying that Chief Financial Officer P Sampath will be succeeded by Deepark Maheshawri, who has a "strong track record of providing strategic financial and capital markets advice across a number of industries". John Laing Infrastructure Fund, a public private partnership infrastructure firm, was also on the rise after it posted a solid increase in its annual portfolio value while lifting net asset value and its dividend payment. Meanwhile, Ocado retreated after making strong gains at the end of last week on the back of an upbeat set of results and a potential tie-up with Morrison Supermarkets. FTSE 250 - RisersEssar Energy (ESSR) 152.30p +3.61%IP Group (IPO) 140.20p +3.16%Synthomer (SYNT) 223.60p +2.57%WH Smith (SMWH) 740.00p +2.42%Rotork (ROR) 3,048.00p +2.38%Bovis Homes Group (BVS) 665.50p +2.38%Bwin.party Digital Entertainment (BPTY) 148.20p +2.28%Chemring Group (CHG) 261.30p +2.11%Drax Group (DRX) 592.50p +2.07%Wetherspoon (J.D.) (JDW) 526.00p +2.04%FTSE 250 - FallersOcado Group (OCDO) 158.40p -13.58%Petra Diamonds Ltd.(DI) (PDL) 121.60p -6.46%Anite (AIE) 128.70p -4.03%Bumi (BUMI) 333.90p -3.86%Dunelm Group (DNLM) 822.00p -3.69%Ferrexpo (FXPO) 198.50p -3.59%Lonmin (LMI) 317.90p -3.37%Vesuvius (VSVS) 390.30p -2.93%KCOM Group (KCOM) 82.05p -2.73%Rathbone Brothers (RAT) 1,492.00p -2.61%NR