Defence contractor Chemring dropped after it issued a profits warning, saying a computer glitch and production delays are likely to wipe 15m pounds off full-year earnings as it considers a takeover offer from private equity giant Carlyle. Heading the other way was chemicals group Yule Catto after reporting a pre-tax profit of £56m in the first half, up from £52.4m the year before. Sales, however, fell to £603.3m from £664.3m. Oil and gas explorer Cairn Energy fell after unveiling plans to acquire a half-share in the Foum Draa block in Morocco, diluting the stakes of San Leon Energy, Serica Energy, Longreach Oil and Gas Ventures. FTSE 250 - RisersYule Catto & Co (YULC) 159.60p +12.55%Moneysupermarket.com Group (MONY) 138.40p +5.65%Ted Baker (TED) 1,011.00p +4.55%Centamin (DI) (CEY) 79.20p +4.01%Dialight (DIA) 1,117.00p +4.00%Imagination Technologies Group (IMG) 585.50p +3.35%Carpetright (CPR) 641.00p +2.48%Renishaw (RSW) 1,565.00p +2.35%Menzies(John) (MNZS) 616.00p +2.07%SIG (SHI) 103.70p +1.77%FTSE 250 - FallersChemring Group (CHG) 323.40p -12.71%BTG (BTG) 304.50p -4.46%Bumi (BUMI) 339.60p -4.34%Afren (AFR) 125.10p -3.70%Cairn Energy (CNE) 285.90p -3.51%Man Group (EMG) 73.50p -2.97%Cape (CIU) 187.60p -2.85%Ashtead Group (AHT) 271.30p -2.69%EnQuest (ENQ) 112.10p -2.69%Brewin Dolphin Holdings (BRW) 143.90p -2.64%NR