Oil groups EnQuest and Premier Oil are being helped higher by surging prices. Sportingbet is gaining 5% after amounts wagered in the quarter ended 31 January rose 10.6%. Sector peer Betfair rises in sympathy.Kier Group is wanted after a strong first half performance that saw revenues increase by 9% and underlying pre-tax profits rise by a quarter.Heading the opposite direction is soft drinks group Britvic after raising its cost inflation guidance for 2011 to 9-11%, from 5-6%.Bodycote is also under the weather despite swinging into the black in 2010 to 345.2m, from a pre-tax loss of £54.5m in 2009.FTSE 250 - RisersEnQuest (ENQ) 146.30p +8.45%Sportingbet (SBT) 47.30p +5.11%Sports Direct International (SPD) 180.00p +3.03%Betfair Group (BET) 891.50p +3.00%Premier Oil (PMO) 2,018.00p +2.70%Morgan Crucible Co (MGCR) 290.60p +2.50%Kier Group (KIE) 1,310.00p +2.42%JPMorgan Russian Securities (JRS) 673.00p +1.74%Hunting (HTG) 766.50p +1.52%Babcock International Group (BAB) 550.00p +1.48%FTSE 250 - FallersBritvic (BVIC) 364.90p -12.70%Yule Catto & Co (YULC) 213.60p -5.99%Ocado Group (OCDO) 210.00p -5.19%Kenmare Resources (KMR) 35.01p -3.82%Mcbride (MCB) 145.30p -3.77%Howden Joinery Group (HWDN) 115.90p -3.66%Booker Group (BOK) 57.95p -3.66%Bodycote (BOY) 287.90p -3.62%Enterprise Inns (ETI) 95.50p -3.44%Premier Foods (PFD) 26.50p -3.25%