Telecoms firm Cable and Wireless Worldwide (CWW) leapt after rival Vodafone confirmed it is considering making a bid for the firm. Prior to today's announcement, CWW's shares had lost almost three-quarters of their value over the last year after a series of profit warnings. Telecom Plus, the utility provider which trades as Utility Warehouse, rose strongly after saying full-year profits are expected to be slightly ahead of market expectations as it enjoyed a recent acceleration in organic growth.Meanwhile, trading systems developer Fidessa fell after predicting growth in 2012 is likely to be at levels which are lower than it saw during 2011, saying conditions will remain difficult for some time to come."Conditions in the financial markets during 2011 were generally more difficult than many of our customers were anticipating, with a widely expected uptick in the second half failing to materialise as the euro zone crisis deepened," Fidessa explained. Northern Russia-focused oil producer Exillon Energy also took a hit, despite reporting that it has seen total proved (1P) recoverable reserves increase by 12% in the eleven months ended November 1st. Data centre provider Telecity fell despite saying that full-year revenues came in slightly ahead of expectations. Revenue rose 22.1% while adjusted pre-tax profit increased 26.3%. FTSE 250 - RisersCable & Wireless Worldwide (CW.) 26.11p +32.20%Kenmare Resources (KMR) 56.55p +6.50%Cable & Wireless Communications (CWC) 38.31p +5.45%Henderson Group (HGG) 128.50p +4.39%Ferrexpo (FXPO) 347.70p +4.10%Lonmin (LMI) 1,053.00p +3.74%Heritage Oil (HOIL) 197.40p +3.19%TUI Travel (TT.) 208.10p +3.12%St James's Place (STJ) 377.00p +3.09%Interserve (IRV) 316.20p +3.00%FTSE 250 - FallersFidessa Group (FDSA) 1,617.00p -4.71%Perform Group (PER) 258.40p -3.62%Supergroup (SGP) 536.50p -3.59%Computacenter (CCC) 404.60p -2.27%Allied Gold Mining (ALD) 129.00p -2.27%Savills (SVS) 362.10p -2.14%Catlin Group Ltd. (CGL) 428.40p -1.86%Restaurant Group (RTN) 300.00p -1.64%Kesa Electricals (KESA) 79.75p -1.60%Exillon Energy (EXI) 257.10p -1.31%NR