Shares in Petropavlovsk, a Russia-focused gold group, leapt over 10 per cent after the company increased its production target to 700,000oz and reduced its cost expectations. Gold production has jumped 29%, while the average realised gold sales price has soared 15% and total gold sold during the first five months of the year climbed 12% compared to the same period in 2011. First quarter revenues and profits were down at electronics components supplier Premier Farnell, but the group said sales are stabilising. The share price was up despite total revenue in the February to April quarter was down 5.0% at £241.0m from £252.5m the year before. Meanwhile, European IT services provider Computacenter said it expects its Supply Chain business to experience high single digit growth for the first half of 2012, but fell after it warned it will be required to invest significantly over the remainder of the year. FTSE 250 - RisersPetropavlovsk (POG) 454.00p +10.49%COLT Group SA (COLT) 126.10p +9.08%Premier Farnell (PFL) 161.70p +5.55%Redrow (RDW) 112.90p +5.22%F&C Asset Management (FCAM) 76.50p +4.79%Telecom Plus (TEP) 831.00p +4.73%Barr (A.G.) (BAG) 366.70p +4.47%Paragon Group Of Companies (PAG) 164.50p +3.98%Yule Catto & Co (YULC) 181.90p +3.88%Talvivaara Mining Company (TALV) 142.70p +3.41%FTSE 250 - FallersComputacenter (CCC) 310.90p -12.84%Ruspetro (RPO) 124.50p -10.43%Kentz Corporation Ltd. (KENZ) 344.90p -6.28%Bumi (BUMI) 315.20p -4.48%Petra Diamonds Ltd.(DI) (PDL) 118.10p -4.14%Imagination Technologies Group (IMG) 425.60p -3.93%Smith (DS) (SMDS) 134.30p -3.38%Melrose (MRO) 385.70p -3.21%Aveva Group (AVV) 1,580.00p -3.19%Cairn Energy (CNE) 279.60p -3.15%NR