- Supermarkets rise after Tesco's results- BHP, Fresnillo lead miners higher- Markets await MPC minutesLondon's blue chips opened broadly flat on Wednesday morning despite a strong rise by supermarket and mining stocks.Stocks rose strongly on Tuesday, with the Footsie gaining nearly two per cent, on more positive news flow from Europe. "Relatively good demand in Spanish t-bill auctions, strong ZEW and forecasts beating earnings results led the better sentiment in risky assets yesterday...with some investors probably covering their short positions, which are likely to have increased in the past few weeks' periphery sell-off," said analyst Cagdas Aksu from Barclays Capital.On the domestic economic front, the minutes from the April meeting of the Monetary Policy Committee (MPC), the policy-setting team at the Bank of England, will be released. "We expect see the same vote pattern as in March (unanimous for leaving Bank Rate unchanged, Adam Posen and David Miles voting for more QE [quantitative easing])," revealed Barclays Capital (BarCap). UK jobless figures will be released at 9:30am. The claimant count rate for March is expected to remain unchanged from February's level at 5%, with the claimant count forecast to have risen by 7,000 in March after rising 7,200 in February. FTSE 100: Tesco rises after in-line resultsSupermarket giant Tesco has delivered full year results in line with latest market consensus, as it announced plans to slash capital expenditure in the current fiscal year. Underlying profit before tax in the 52 weeks to February 25th rose 1.6% to £3.9bn, marginally ahead of market expectations of £3.6bn. Sector peers Morrison and Sainsbury were also in demand.Mining group BHP Billiton was a high riser after iron ore production at its Western Australian operations still hit record levels in the nine months to the end of March, despite cyclone activity depressing third quarter production. Meanwhile, Fresnillo has hailed a strong start to 2012 with gold production beating its own expectations and silver output being on target. Evraz, ENRC and Vedanta Resources were also higher.Financials were leading the downside this morning, with Resolution, Legal & General and Old Mutual among the heaviest fallers.International distribution and outsourcing group Bunzl fell despite saying trading in 2012 has been strong, with the group seeing solid top line growth and an improvement in the group operating margin.Engineering group GKN also underwhelmed the markets to fall after reporting a 17% increase in year-on-year sales in the first quarter.FTSE 250: Computacenter, Heritage fall early onEuropean IT services provider Computacenter was a heavy faller after saying that margins had been hit in the first quarter due to the costs of moving staff into new roles in its services division and sales commissions.Oil and gas exploration and production company Heritage Oil saw losses from continuing operations widen in 2011 as it cranked up its capital expenditure programme.Precious metals producer Hochschild Mining was on the up after saying it is on track to deliver its 2012 full-year production target after a 'solid start to the year'. FTSE 100 - RisersFresnillo (FRES) 1,610.00p +2.35%Tesco (TSCO) 334.20p +1.80%BHP Billiton (BLT) 1,957.00p +1.58%Admiral Group (ADM) 1,214.00p +1.51%Morrison (Wm) Supermarkets (MRW) 300.40p +1.45%Rio Tinto (RIO) 3,566.00p +1.38%Antofagasta (ANTO) 1,190.00p +1.19%Standard Life (SL.) 229.10p +1.01%Shire Plc (SHP) 2,021.00p +1.00%Randgold Resources Ltd. (RRS) 5,545.00p +1.00%FTSE 100 - FallersBAE Systems (BA.) 289.90p -4.58%Resolution Ltd. (RSL) 228.30p -4.48%Legal & General Group (LGEN) 120.30p -3.14%Capita (CPI) 732.50p -2.07%Evraz (EVR) 371.30p -1.56%Old Mutual (OML) 153.10p -1.48%Aggreko (AGK) 2,208.00p -1.38%Petrofac Ltd. (PFC) 1,716.00p -1.38%GKN (GKN) 208.90p -1.23%CRH (CRH) 1,264.00p -1.17%FTSE 250 - RisersAshtead Group (AHT) 251.20p +3.72%Kenmare Resources (KMR) 50.75p +3.26%Cable & Wireless Worldwide (CW.) 37.09p +2.66%Stobart Group Ltd. (STOB) 128.70p +2.47%International Personal Finance (IPF) 245.20p +2.08%Henderson Group (HGG) 123.80p +1.98%AG Barr (BAG) 1,161.00p +1.40%African Barrick Gold (ABG) 366.50p +1.36%Anglo Pacific Group (APF) 308.10p +1.35%Perform Group (PER) 305.00p +1.33%FTSE 250 - FallersComputacenter (CCC) 422.00p -3.50%Heritage Oil (HOIL) 141.90p -3.14%HICL Infrastructure Company Ltd (HICL) 119.90p -2.99%BBA Aviation (BBA) 203.90p -2.44%KCOM Group (KCOM) 70.60p -1.94%JD Sports Fashion (JD.) 786.50p -1.87%Spirax-Sarco Engineering (SPX) 2,214.00p -1.73%BH Global Ltd. USD Shares (BHGU) 11.6 -1.61%Redrow (RDW) 124.80p -1.50%Northgate (NTG) 193.10p -1.48%BC