Halfords raced to the top of the leaderboard today after it trounced third-quarter analyst forecasts with a period of rapid top-line growth, driven by mild weather and continued retail reinvigoration by Chief Executive Matt Davies. Polymetal International climbed following an upgrade from UBS AG to 'buy'. As on the top tier index, miners rose after Citigroup lifted its stance on the sector from 'neutral' to 'bullish', marking its first positive outlook for the industry in three years. Meanwhile, SVG Capital declined sharply after Aegon sold £84m-worth of shares in the company. The company disposed of 20m shares at 420p each, reducing its holding to around 18.5m, equal to a 7.9% stake, a significant reduction to its previous holding of 15.4%. Shares in electronics retailer Dixons declined after the company warned its fourth quarter would be "more modest" than its strong third quarter. The group said it experienced an up-and-down period between November 1st and January 4th, with group like-for-like sales levelling out with 3% growth, although group gross margins were down 0.5%, most likely due to discounting.FTSE 250 - RisersHalfords Group (HFD) 494.30p +7.22%Polymetal International (POLY) 544.00p +5.84%Vedanta Resources (VED) 902.50p +3.68%Victrex (VCT) 1,873.00p +3.31%CSR (CSR) 700.00p +2.94%Computacenter (CCC) 663.50p +2.87%Hellermanntyton Group (HTY) 309.90p +2.62%Lonmin (LMI) 308.80p +2.29%BlackRock World Mining Trust (BRWM) 470.30p +2.02%Ferrexpo (FXPO) 175.60p +1.80%FTSE 250 - FallersSVG Capital (SVI) 426.60p -8.45%Dixons Retail (DXNS) 47.37p -6.01%Premier Oil (PMO) 291.70p -5.29%Homeserve (HSV) 291.10p -4.87%Xaar (XAR) 1,025.00p -4.56%IP Group (IPO) 172.60p -4.38%Ted Baker (TED) 2,130.00p -4.14%Hikma Pharmaceuticals (HIK) 1,243.00p -4.09%Rank Group (RNK) 141.10p -3.75%Keller Group (KLR) 1,194.00p -3.08%NR