Victrex is among the best performers after the plastics group said profit surged 57% and sales volumes rose 22% in the last six months after a strong performance in all of its major markets. Due to MITIE's underperformance against the peer group, Peel Hunt upgraded its rating on the outsourced services provider to 'hold', from 'sell', helping shares higher on Tuesday.Cable & Wireless Worldwide shares climbed as it squeezed out a higher profit in the year to 31 March despite revenues coming under pressure due to the impact of UK public sector cuts.Homeserve, the home emergency repairs outfit, fell lower despite growing underlying revenues by 15% in the year ended 31 March, helped by its growing international footprint.Premier Oil, Centamin Egypt and Talvivaara Mining are among the high risers on the back of firmer commodities prices.Self-storage group Big Yellow is under the weather despite revenue rising by 7% in the 12 months to 31 March.---BCFTSE 250 - RisersSports Direct International (SPD) 227.20p +6.97%Victrex (VCT) 1,490.00p +6.35%Mitie Group (MTO) 231.00p +4.81%Cable & Wireless Worldwide (CW.) 51.95p +4.61%Pace (PIC) 102.50p +4.38%Centamin Egypt Ltd. (CEY) 125.60p +3.46%Premier Oil (PMO) 468.20p +3.13%Babcock International Group (BAB) 693.00p +3.12%Talvivaara Mining Company (TALV) 479.10p +2.83%Travis Perkins (TPK) 1,029.00p +2.80%FTSE 250 - FallersCPP Group (CPP) 129.10p -2.93%Petropavlovsk (POG) 717.50p -2.71%TalkTalk Telecom Group (TALK) 145.10p -2.68%Micro Focus International Plc (MCRO) 371.50p -2.49%Big Yellow Group (BYG) 336.60p -2.26%COLT Group SA (COLT) 143.30p -2.18%FirstGroup (FGP) 341.60p -2.18%Dixons Retail (DXNS) 19.48p -2.16%Britvic (BVIC) 427.70p -2.08%Enterprise Inns (ETI) 76.60p -2.05%