British electrical power company Drax Group rose after the UK government confirmed that two of its units converted to burn sustainable biomass to meet the eligibility and minimum evaluation criteria for investment contracts. Construction and infrastructure services stocks including Interserve and Balfour Beatty gained after UK services PMI showed continued expansion in November, albeit at a slower pace than October, as new business rose at a rapid pace.Ashmore Group slumped after Berensbank yesterday restated its 'buy' rating on the shares of the British investment manager. Synthomer declined as the maker of latex emulsion resins and binders received a 'buy' rating from analysts at Canaccord Genuity.FTSE 250 - RisersDrax Group (DRX) 742.50p +8.55%RPC Group (RPC) 521.50p +3.06%Telecom Plus (TEP) 1,819.00p +2.71%Interserve (IRV) 650.00p +2.36%Ladbrokes (LAD) 171.90p +2.26%Balfour Beatty (BBY) 263.30p +2.13%Menzies(John) (MNZS) 785.00p +2.08%St. Modwen Properties (SMP) 359.20p +2.02%Perform Group (PER) 419.30p +2.02%Workspace Group (WKP) 502.00p +1.80%FTSE 250 - FallersAshmore Group (ASHM) 370.30p -3.82%Synthomer (SYNT) 220.90p -3.66%Renishaw (RSW) 1,760.00p -3.35%Direct Line Insurance Group (DLG) 221.30p -3.32%BBA Aviation (BBA) 316.30p -3.12%LondonMetric Property (LMP) 126.80p -3.06%Alent (ALNT) 331.60p -2.70%TR Property Inv Trust (TRY) 218.50p -2.67%Kenmare Resources (KMR) 19.40p -2.61%Hiscox Ltd (HSX) 638.00p -2.60%RD