Barratt is among today's heaviest fallers amid speculation the housebuilder will announce a rights issue to coincide with its full-year results.Oil explorer Heritage Oil said it has completed the testing of the Miran West-1 discovery in the Kurdistan region of Iraq, but its shares are also firmly lower.Construction and regeneration group Morgan Sindall is bucking the trend after it said its affordable housing division has been confirmed as a preferred partner for a £35m regeneration scheme in Skipton, North Yorkshire.FTSE 250 - RisersEcofin Water & Power Opportunities (ECWO) 135.50p +4.23%Fisher (James) & Sons (FSJ) 466.00p +2.42%Rathbone Brothers (RAT) 780.00p +0.58%Catlin Group (CGL) 318.60p +0.44%Brit Insurance Holding (BRE) 201.20p +0.35%Morgan Sindall (MGNS) 599.00p +0.17%COLT Telecom Group S.A. (COLT) 117.10p +0.09%Lancashire Holdings (LRE) 448.70p +0.07%Marston's (MARS) 96.00p 0.00%Venture Production (VPC) 840.00p 0.00%FTSE 250 - FallersMelrose Resources (MRS) 322.40p -8.54%Aquarius Platinum Ltd. (AQP) 261.10p -7.44%Barratt Developments (BDEV) 222.90p -7.16%Punch Taverns (PUB) 104.50p -7.03%Heritage Oil (HOIL) 535.00p -6.88%Ferrexpo (FXPO) 159.50p -6.73%Big Yellow Group (BYG) 370.10p -6.68%FirstGroup (FGP) 349.80p -6.47%Shaftesbury (SHB) 369.90p -6.43%RPS Group (RPS) 182.00p -6.23%