Croda's strong numbers have sparked a strong positive reaction. Record results at its two main divisions helped the speciality chemicals supplier double half year pre-tax profit, with strong trading trickling into the first weeks of the second half.Engineer Tomkins has motored ahead after its board backed the 325p per share cash offer from Onex and Canada Pension Plan Investment Board.Software group Misys is also in demand after saying it has reduced the number of shares it will sell in the proposed disposal of its healthcare division Allscripts.The top riser in the FTSE 250 is Connaught, which rallies partially after sliding yesterday as it warned of more woe following the emergency Budget, which will hurt the company severely.Today's heaviest faller is e-learning specialist Promethean World. The company's first half revenues are up 35% with strong sales of both systems and handsets.International consumer products group PZ Cussons is lower even after the company most famous for making soap saw profitable growth last year in all three of its operating regions.Car parts and bicycles retailer Halfords is facing an uphill struggle to convince the market today even after it drove through a 9.6% rise in group revenue from 3 April to 26 July, helped by its acquisition of Nationwide Autocentres in February, but it issued a cautionary stance on the economic environment.FTSE 250 - RisersConnaught (CNT) 34.80p +10.62%Yell Group (YELL) 29.13p +8.90%Croda International (CRDA) 1,248.00p +6.39%Tomkins (TOMK) 323.60p +5.24%Daejan Holdings (DJAN) 2,399.00p +4.03%Misys (MSY) 260.00p +3.92%Forth Ports (FPT) 1,300.00p +3.83%Game Group (GMG) 77.95p +3.79%Salamander Energy (SMDR) 233.50p +3.78%Paragon Group Of Companies (PAG) 135.40p +3.68%FTSE 250 - FallersPromethean World (PRW) 150.00p -4.76%Provident Financial (PFG) 843.00p -4.48%PZ Cussons (PZC) 345.70p -3.97%Petropavlovsk (POG) 1,067.00p -2.91%Babcock International Group (BAB) 581.00p -2.68%Unite Group (UTG) 180.20p -2.59%Weir Group (WEIR) 1,218.00p -2.56%Supergroup (SGP) 930.00p -2.31%Halfords Group (HFD) 505.00p -2.23%Ultra Electronics Holdings (ULE) 1,632.00p -2.04%