Shares in engineer Charter International jumped after it revealed that Colfax, the US manufacturing group that was earlier this month named as a mystery bidder for Charter, is considering making a 910p a share offer.Colfax - which supplies fluid-handling products including pumps, fluid handling systems and controls, and speciality valves - gatecrashed rival engineer Melrose's offer for Charter last month. Melrose upped its bid for Charter to 850p from 840p earlier this month. Shares in wealth management group St James's Place dropped following the company's announcement that it would continue its scrip dividend mandate scheme, with scrip dividends replacing interim cash dividends for the year ending 31 December 2011. Scrip dividends, an alternative to a cash dividend which allows shareholders to reinvest in the company by receiving shares, rather than cash, were accepted in respect of 15.8m shares, worth around 3.2% o the company's issued share capital. FTSE 250 - RisersCharter International (CHTR) 862.00p +7.21%Mitchells & Butlers (MAB) 225.90p +2.64%Gem Diamonds Ltd. (DI) (GEMD) 213.90p +1.86%Afren (AFR) 105.50p +1.74%Jardine Lloyd Thompson Group (JLT) 624.50p +1.38%Savills (SVS) 292.70p +1.35%BH Macro Ltd. EUR Shares (BHME) € 19.56 +1.29%Melrose (MRO) 283.50p +1.25%Impax Environmental Markets (IEM) 98.65p +1.18%Dexion Absolute Ltd. GBP Shares (DAB) 141.80p +1.14%FTSE 250 - FallersNew World Resources A Shares (NWR) 535.00p -7.12%International Personal Finance (IPF) 220.00p -6.34%Morgan Crucible Co (MGCR) 249.20p -5.75%Imagination Technologies Group (IMG) 346.80p -5.06%Talvivaara Mining Company (TALV) 291.40p -4.71%Kenmare Resources (KMR) 42.38p -4.66%EnQuest (ENQ) 97.25p -4.66%Bwin.party Digital Entertainment (BPTY) 112.00p -4.52%St James's Place (STJ) 321.90p -4.48%Salamander Energy (SMDR) 202.90p -4.47%NR