Debenhams was a high riser following an upgrade by Bank of America to "buy" from "neutral". Analyst Aurelie Caspar said that in recent times Debenhams has "showed a department store chain with a strong multichannel offer can deliver consistent profit growth, provided the offer is sufficiently differentiated". Speciality insurance company Catlin Group also rose after seeing an increase in the amount of premiums written in the three months to the end of March, while avoiding any catastrophe claims. Overall premiums are up 12% against the prior year, totalling $1.642bn. ?Mining stocks dropped, tracking their top-tier counterparts lower with Lonmin, Ferrexpo, Petropavlovsk, Bumi, Avocet Mining and New World Resources suffering steep losses. Bumi was down despite posting a nine per cent year-on-year rise in first quarter coal production at 20m tonnes. Investors may have been put off by the fact its operating performance was affected by high levels of rainfall. In addition, production unit costs were higher, mainly due to increased fuel costs and a higher stripping ratio. FTSE 250 - RisersDebenhams (DEB) 80.45p +4.55%Telecity Group (TCY) 798.50p +4.24%Home Retail Group (HOME) 81.30p +3.77%Northgate (NTG) 199.70p +3.31%PZ Cussons (PZC) 337.30p +3.12%Berkeley Group Holdings (The) (BKG) 1,253.00p +2.62%Yule Catto & Co (YULC) 223.00p +2.29%TalkTalk Telecom Group (TALK) 132.10p +2.24%Micro Focus International (MCRO) 469.40p +2.24%Anglo Pacific Group (APF) 289.00p +2.19%FTSE 250 - FallersDixons Retail (DXNS) 17.18p -5.76%Petra Diamonds Ltd.(DI) (PDL) 141.40p -5.73%Bumi (BUMI) 436.20p -5.71%Lonmin (LMI) 900.00p -5.06%Imagination Technologies Group (IMG) 602.00p -4.75%Exillon Energy (EXI) 114.20p -4.11%COLT Group SA (COLT) 112.20p -4.02%Ferrexpo (FXPO) 252.20p -3.56%Babcock International Group (BAB) 784.00p -2.73%Logica (LOG) 71.90p -2.64%NR