Mining group Bumi advanced after saying it has appointed Rothschild Goup as its financial adviser with immediate effect to evaluate the proposal received from Long Haul Holdings. Shares in Dixons rose once again, boosted by the news that its main High Street rival, Comet, is likely to go into administration. Also Seymour Pierce has said that John Lewis's strong start to their new Windows 8 range is a positive sign for Dixons. Meanwhile, hotels group Millennium & Copthorne fell despite seeing RevPAR rise 2.6% in the third quarter, with London enjoying an Olympic boost. Hikma Pharmaceuticals also fell after saying it is considering the future of its Generics business as its Eatontown facility in New Jersey continues to be dogged by compliance issues.Gold miner Centamin has once again taken a hit, one day after shares rebounded after returning to the market following a suspension from trade. Earlier this week the firm's shares plummeted after media reports claimed that an Egyptian court had labelled its Sukari mining concession, its primary source of revenue, as void. FTSE 250 - RisersBumi (BUMI) 280.70p +13.05%Dixons Retail (DXNS) 25.60p +9.50%Chemring Group (CHG) 279.00p +7.06%Homeserve (HSV) 236.20p +5.82%Brown (N.) Group (BWNG) 354.10p +4.24%Spectris (SXS) 1,827.00p +3.81%FirstGroup (FGP) 208.00p +3.79%Ruspetro (RPO) 105.00p +3.75%Premier Oil (PMO) 364.70p +3.49%Ferrexpo (FXPO) 227.10p +3.32%FTSE 250 - FallersCentamin (DI) (CEY) 60.80p -9.39%Millennium & Copthorne Hotels (MLC) 479.00p -6.35%Lancashire Holdings (LRE) 847.50p -3.09%Ocado Group (OCDO) 62.25p -3.04%Debenhams (DEB) 120.00p -2.99%Hikma Pharmaceuticals (HIK) 735.00p -2.52%Balfour Beatty (BBY) 312.80p -2.49%Computacenter (CCC) 361.10p -1.69%ICAP (IAP) 330.50p -1.61%BTG (BTG) 336.40p -1.58%NR