A decline in revenue recorded by communications and information technology firm Colt and car parts and bike retailer Halfords disappointed investors but failed to sway the mid-cap stock index lower. Colt announced a 3.5% reduction in revenues in the first half of the year, mainly driven by a decline in mobile termination rates, while Halfords, which saw group sales rising 0.3%, reported a 1.1% drop in retail sales. On the other hand, De La Rue, banknote and security printer, said it remains confident in the trading outlook for the full year, despite ongoing paper problems at its Currency Division. Also giving a boost to the index was Russian gold miner Petropavlovsk's production update. Petropavlovsk recorded a 32% rise in total gold production in the first half of the year and said it was on track to achieving its target of 600,000 ounces of gold for the year.FTSE 250 - RisersHowden Joinery Group (HWDN) 114.70p +6.80%Catlin Group Ltd. (CGL) 412.90p +5.33%Heritage Oil (HOIL) 249.40p +4.13%Telecom Plus (TEP) 672.50p +3.86%Regus (RGU) 107.70p +3.66%TUI Travel (TT.) 191.50p +3.63%St James's Place (STJ) 373.20p +3.27%Close Brothers Group (CBG) 778.00p +3.05%Petropavlovsk (POG) 846.50p +2.98%Melrose (MRO) 366.30p +2.84%FTSE 250 - FallersCOLT Group SA (COLT) 116.60p -11.53%Halfords Group (HFD) 343.50p -3.84%JD Sports Fashion (JD.) 958.50p -3.18%Fidessa Group (FDSA) 1,877.00p -3.10%Mitchells & Butlers (MAB) 282.50p -2.89%Rank Group (RNK) 146.50p -2.79%Caledonia Investments (CLDN) 1,743.00p -2.08%Daejan Holdings (DJAN) 2,827.00p -2.01%JPMorgan Asian Inv Trust (JAI) 236.50p -1.99%Perform Group (PER) 202.70p -1.98%