Oil and gas engineer Lamprell was the best performer of the day after revenues rose by 18.4% in 2010, with the strength of the oil price contributing to unprecedented levels of enquiries.Military decoy flares and mine detection firm Chemring wasn't far behind after it said it remains confident for 2011 as its order book surges.Also higher was Scottish soft drinks maker AG Barr after serving up a 13.3% increase in full year pre-tax profit, as a result of a strong performance across its core brands. Exillon Energy's latest appraisal well on its West Siberia prospect has found more oil, this time on the northern extension of the East EWS I field, sending the share price up.Engineer Senior edged lower after announced that is paying $24.5m for the Damar Machine Company, a US manufacturer and integrator of precision machined parts and assemblies for the commercial aerospace industry.BCFTSE 250 - RisersLamprell (LAM) 331.00p +5.41%Chemring Group (CHG) 736.50p +5.21%AG Barr (BAG) 1,201.00p +3.98%easyJet (EZJ) 335.60p +3.42%CPP Group (CPP) 280.00p +3.40%Laird (LRD) 139.40p +2.95%TalkTalk Telecom Group (TALK) 134.30p +2.83%Ladbrokes (LAD) 133.70p +2.77%Rathbone Brothers (RAT) 1,200.00p +2.56%William Hill (WMH) 184.00p +2.51%FTSE 250 - FallersAquarius Platinum Ltd. (AQP) 344.30p -6.95%Kenmare Resources (KMR) 40.00p -4.08%Grainger (GRI) 109.50p -3.52%Redrow (RDW) 125.80p -2.93%Sports Direct International (SPD) 190.40p -2.91%Dixons Retail (DXNS) 16.61p -2.87%Carpetright (CPR) 729.00p -2.54%Dunelm Group (DNLM) 410.40p -2.17%Regus (RGU) 116.50p -2.10%Brown (N.) Group (BWNG) 269.00p -2.04%