Travel company Thomas Cook falls sharply after it started a review of its UK cost base after softer than expected business over the summer and in view of the difficult market backdrop."Our cost experience in the UK has not been as favourable as expected, particularly in the airline, and this will result in a net impact of around £10m on the underlying operating profit," Thomas Cook said.On the plus side, the horrors of the credit crunch are becoming a faint memory for specialist mortgage lender Paragon, one of today's top risers, with performance in the third quarter of its financial year continuing to be strong.Sports Direct's shares are sharply higher today despite, or perhaps because of, the woes of its rival sportswear retailer JJB Sports.JJB posted heavy interim losses and indicated it will need more sales and promotions to keep momentum going.FTSE 250 - RisersSports Direct International (SPD) 138.80p +5.39%Paragon Group Of Companies (PAG) 169.90p +4.04%Talvivaara Mining Company (TALV) 487.70p +3.33%Computacenter (CCC) 304.80p +3.15%Xchanging (XCH) 156.60p +3.09%Jupiter Fund Management (JUP) 259.10p +2.86%Unite Group (UTG) 216.50p +2.61%Berkeley Group Holdings (BKG) 839.50p +2.57%Domino Printing (DNO) 548.50p +2.43%Electrocomponents (ECM) 236.90p +2.24%FTSE 250 - FallersThomas Cook Group (TCG) 170.45p -7.01%Micro Focus International Plc (MCRO) 366.60p -4.83%Pace (PIC) 177.60p -3.90%Rank Group (RNK) 118.30p -3.66%Hansen Transmissions International (HSN) 52.60p -3.22%Avis Europe (AVE) 216.00p -3.14%Petropavlovsk (POG) 1,188.00p -3.10%CSR (CSR) 343.00p -3.00%Barratt Developments (BDEV) 100.90p -2.98%Mcbride (MCB) 186.30p -2.92%