Online grocer Ocado jumped after saying it had secured more time to pay off debts and would raise 35.8m pounds through a placing of shares. The firm said it would use the extra time and money to increase its ranges, improve the customer experience and go on a marketing drive. Platinum miner Lonmin was following close behind on continuing optimism after shareholder Xstrata announced that it would take part in the firm's upcoming capital call. Meanwhile, outsourcing group Mitie appears to be suffering some pressure on margins, which coupled with higher costs has resulted in disappointing interims. Although revenues grew 5.6% to £1,026.6m (2011: 971.7m) in the six months ended September 30th 2012, pre-tax profits fell 12.9% to £37.7m (2011: £43.3m) after the cost of sales climbed from £818.7m to £874.8m. Shares in Dunelm were retreating after the company informed investors on Friday that it intends to return around £65.8m of capital to shareholders, equivalent to 32.5p per ordinary share. FTSE 250 - RisersOcado Group (OCDO) 75.00p +23.86%Lonmin (LMI) 516.00p +9.48%Ferrexpo (FXPO) 212.60p +7.37%Essar Energy (ESSR) 125.90p +5.80%London Stock Exchange Group (LSE) 983.00p +5.02%Talvivaara Mining Company (TALV) 110.90p +4.92%Fidessa Group (FDSA) 1,363.00p +4.28%Afren (AFR) 135.40p +3.83%Henderson Group (HGG) 113.20p +3.76%Hunting (HTG) 741.50p +3.56%FTSE 250 - FallersMitie Group (MTO) 277.60p -4.28%Dunelm Group (DNLM) 642.50p -4.10%Supergroup (SGP) 618.50p -3.13%Stobart Group Ltd. (STOB) 108.60p -2.07%Raven Russia Ltd (RUS) 63.75p -1.62%Homeserve (HSV) 221.70p -1.47%NMC Health (NMC) 177.60p -1.33%Cranswick (CWK) 757.00p -1.11%Utilico Emerging Markets Ltd (DI) (UEM) 161.50p -0.92%Invensys (ISYS) 217.70p -0.82%NR