Investors are toasting pub group and real ale brewer Marston's assertion that it has seen a modest improvement in trading since February. Chairman Ralph Findlay said he is cautiously optimistic as the company reported a 21% drop in half year pre-tax profits.National Express is higher the day after saying it is to sell its London bus business Travel London to a subsidiary of NS Dutch Railways.FTSE 250 - RisersCookson Group (CKSN) 240.25p +8.59%National Express Group (NEX) 298.00p +6.81%Marston's (MARS) 169.50p +6.10%Talvivaara Mining Company (TALV) 295.50p +5.91%Dunedin Income Growth Inv Trust (DIG) 161.75p +5.72%Bodycote (BOY) 149.00p +5.67%Sports Direct International (SPD) 77.75p +5.42%Mondi (MNDI) 199.00p +5.01%Ferrexpo (FXPO) 165.00p +4.60%Game Group (GMG) 177.50p +4.57%FTSE 250 - FallersEuromoney Institutional Investor (ERM) 202.50p -4.48%Melrose (MRO) 107.00p -3.39%Filtrona PLC (FLTR) 121.25p -2.81%Brit Insurance Holding (BRE) 192.50p -2.78%Northern Foods (NFDS) 62.75p -2.71%Inchcape (INCH) 18.25p -2.67%Dana Petroleum (DNX) 1,223.00p -2.47%Heritage Oil (HOIL) 500.00p -2.34%Tomkins (TOMK) 155.50p -2.20%HMV Group (HMV) 120.00p -1.64%