First Group announced on Thursday that its First Great Western franchise has been extended by 23 months, with the government promising users of the line an improved service. Mitchells & Butlers has risen despite analysts at AlphaValue today reiterating a 'sell' rating on the stock. Imagination Technologies was taking a hit after Credit Suisse reaffirmed its 'underperform' rating on the chip designer. As on the top tier index, miners were tracking metal prices lower. FTSE 250 - RisersSupergroup (SGP) 1,182.00p +3.59%Rank Group (RNK) 157.90p +3.54%Mitchells & Butlers (MAB) 399.90p +2.72%FirstGroup (FGP) 123.80p +2.57%UDG Healthcare Public Limited Company (UDG) 323.20p +2.57%Ladbrokes (LAD) 171.40p +2.39%Fenner (FENR) 398.90p +2.15%Moneysupermarket.com Group (MONY) 152.30p +1.87%Alent (ALNT) 360.00p +1.84%Hansteen Holdings (HSTN) 99.95p +1.78%FTSE 250 - FallersImagination Technologies Group (IMG) 309.00p -4.92%Diploma (DPLM) 629.50p -4.26%Chemring Group (CHG) 285.50p -3.38%Kazakhmys (KAZ) 253.90p -3.09%Ophir Energy (OPHR) 309.00p -2.95%Polymetal International (POLY) 629.00p -2.93%RPS Group (RPS) 266.50p -2.70%Keller Group (KLR) 984.00p -2.19%Unite Group (UTG) 380.00p -2.11%QinetiQ Group (QQ.) 184.30p -2.02%