Retailers are providing a drag on the index today, with Mothercare, Dixons, Carpetright, Sports Direct and Dunelm losing 4% or more.Baby clothes retailer Mothercare has seen its share price drop by almost a tenth, after margins were squeezed in the quarter to 26 March.Also under the weather is real estate advisor Savills after RBS kept its 'hold' rating on the stock, seeing little room for the share price to outperform in the medium term. Eastern Europe-focused oil group JKX Oil & Gas reported lower profits in 2010 after suffering from project delays and capital cost increases, sending shares lower.Bucking the trend is home emergency repairs outfit Homeserve after it said it expects strong growth in full-year profits and is confident of hitting the top end of its customer growth target.Cash and carry group Booker is heading higher after a healthy rise in sales in the year to 25 March.BCFTSE 250 - RisersKenmare Resources (KMR) 44.75p +5.79%Tate & Lyle (TATE) 581.00p +3.84%Lamprell (LAM) 346.60p +2.54%Homeserve (HSV) 445.00p +2.02%Betfair Group (BET) 971.00p +1.84%AZ Electronic Materials SA (WI) (AZEM) 278.10p +1.68%Booker Group (BOK) 60.70p +1.68%easyJet (EZJ) 342.90p +1.48%Croda International (CRDA) 1,672.00p +1.46%Aberdeen Asset Management (ADN) 210.90p +1.35%FTSE 250 - FallersMothercare (MTC) 400.60p -9.37%Dixons Retail (DXNS) 12.60p -7.96%Petropavlovsk (POG) 1,002.00p -5.56%Carpetright (CPR) 676.00p -5.19%Sports Direct International (SPD) 185.30p -4.83%JKX Oil & Gas (JKX) 315.80p -4.71%Pace (PIC) 152.70p -4.26%Dunelm Group (DNLM) 394.00p -3.90%Cable & Wireless Worldwide (CW.) 52.30p -3.77%Brown (N.) Group (BWNG) 257.20p -3.63%