Irn-Bru maker Barr is fizzing after a positive update from fellow soft drinks group Britvic, which served up a 5.6% rise in full year revenue and believes it will deliver a strong set of results for the year ahead. A strong bounce in its bonds and currency hedging funds lifted emerging markets fund manager Ashmore's funds under management by 25% in the past three months, sending its share sharply higher.Temporary power supplier Aggreko jumped after it upped its full-year guidance, saying it expects constant-currency profits to be slightly above the level achieved in 2008.Newsagent chain WH Smith announces full year results that saw profit before tax climb by 8% despite a drop in sales. The group also announced that it is returning up to £35m of cash to shareholders through a rolling share buyback programme.Debt laden pubs group Punch Taverns is posting losses again the day after it announced a bigger than expected write down in the value of its pubs assets Wednesday morning and peppered its trading update with cautious comments about near term trading prospects.Automotive and aerospace engineer GKN is labouring after it posted a 3% fall in sales in the three months to September 30 as markets remained tough.FTSE 250 - RisersAshmore Group (ASHM) 301.20p +9.77%Aggreko (AGK) 774.00p +6.25%Laird (LRD) 215.40p +6.00%BlueBay Asset Management (BBAY) 343.00p +5.15%AG Barr (BAG) 880.00p +4.08%WH Smith (SMWH) 516.00p +3.80%Ecofin Water & Power Opportunities (ECWO) 151.00p +3.78%Moneysupermarket.com (MONY) 79.65p +3.58%Regus (RGU) 116.40p +3.01%Melrose Resources (MRS) 360.80p +2.65%FTSE 250 - FallersPunch Taverns (PUB) 90.00p -6.88%GKN (GKN) 120.40p -5.57%Aquarius Platinum Ltd. (AQP) 293.80p -5.47%Polar Cap Technology Trust (PCT) 229.00p -4.98%Rank Group (RNK) 89.85p -4.82%Dimension Data Holdings (DDT) 74.45p -4.55%Petropavlovsk (POG) 1,137.00p -4.45%Yell Group (YELL) 61.40p -4.44%Connaught (CNT) 425.00p -4.28%JPMorgan American Inv Trust (JAM) 663.00p -3.91%