Afren moves ahead after buying a stake in a Nigerian oil field from Shell and Total, helping cement its position in the country.Debenhams is going well after reporting full year results. In the year to August 28, pre-tax profits climbed by 20.6% from the previous year to £151m. Gross transaction value climbed to £2.56bn from £2.34bn, with the acquisition of Danish department store Magasin du Nord accounting nearly all of the rise.Britvic is fizzing after the soft drinks group served up a 33.4% rise in fourth quarter revenue after a robust performance particularly from its French division.FTSE 250 - RisersAfren (AFR) 129.70p +11.91%Debenhams (DEB) 76.00p +6.29%Britvic (BVIC) 500.00p +6.27%Pennon Group (PNN) 633.50p +5.94%Mcbride (MCB) 171.90p +5.40%Ashtead Group (AHT) 126.90p +4.53%William Hill (WMH) 168.90p +4.45%Stobart Group Ltd. (STOB) 148.90p +4.13%ITV (ITV) 67.10p +4.03%Stagecoach Group (SGC) 213.00p +3.85%FTSE 250 - FallersHansen Transmissions International NV (HSN) 41.35p -3.84%Lamprell (LAM) 358.30p -3.42%Xchanging (XCH) 129.60p -3.28%Hunting (HTG) 616.00p -3.22%Provident Financial (PFG) 775.00p -3.06%Regus (RGU) 82.55p -2.77%Carpetright (CPR) 718.50p -2.71%QinetiQ Group (QQ.) 107.60p -2.62%Hays (HAS) 112.70p -2.42%Melrose Resources (MRS) 325.00p -2.40%