ICAP climbed after seeing a 17 per cent increase in electronic volumes in January, with sector peer Tullett Prebon also on the rise. Enterprise Inns rose after Barclays upgraded the stock to overweight. Talk Talk Telecom Group climbed after Barclays raised its target price from 235p to 300p, while maintaining an overweight rating. Meanwhile, Centamin fell after Westhouse Securities downgraded the stock from buy to neutral with a target price of 65p. FTSE 250 - RisersTullett Prebon (TLPR) 272.00p +8.11%New World Resources A Shares (NWR) 280.90p +7.42%IG Group Holdings (IGG) 496.50p +6.43%ICAP (IAP) 359.50p +6.11%Enterprise Inns (ETI) 100.20p +5.75%TalkTalk Telecom Group (TALK) 253.60p +4.79%Man Group (EMG) 94.90p +4.57%Petra Diamonds Ltd.(DI) (PDL) 113.60p +4.41%ITE Group (ITE) 265.70p +4.24%Senior (SNR) 208.60p +4.09%FTSE 250 - FallersCentamin (DI) (CEY) 59.95p -4.16%Workspace Group (WKP) 318.90p -2.89%Debenhams (DEB) 96.15p -2.39%Invensys (ISYS) 342.20p -2.23%Genus (GNS) 1,433.00p -2.18%Dixons Retail (DXNS) 26.27p -2.01%Aberforth Smaller Companies Trust (ASL) 743.50p -1.85%Victrex (VCT) 1,510.00p -1.76%Great Portland Estates (GPOR) 481.20p -1.57%UBM (UBM) 729.50p -1.49%NR