The FTSE 100 has started the day up 22.5 points, or 0.36%, to 6,237.1, led higher by a strong oil and mining sector.
Miner Vedanta Resources is posting the biggest gains so far with a rise of 3.28% to £14.79, closely followed by Swiss miner Xstrata which has climbed 1.91%, or 43p, to £22.97.
Oil stocks are also up with Royal Dutch Shell climbing 3.2% to £19.01, after it reported a better than expected 33% increase in third quarter earnings per share, while production was up to 3.251m barrels per day from 3.207m.
AstraZeneca is the biggest drag on the index so far with a drop of 4.02% to £33.87, on news it has stopped the development of its experimental stroke drug NXY-059 after it failed to reduce significant disability in patients.
Insurer Aviva is also down 1.45% to 780.5p, after announcing sales growth which was below the average market forecast, while Cadbury Schweppes has slipped 1.01% to 540.5p, and British Sky Broadcasting has dropped 0.64% to 542p.
In Japan, the Nikkei 225 Stock Average advanced 112.30, or 0.7%, to 16,811.60 at the 3pm close, as exporters gained after the US Federal Reserve left interest rates unchanged for a third month.
Matsushita, the maker of Panasonic-brand products, climbed 40 yen, or 1.6%, to 2,575, while Canon, the world's largest seller of digital cameras, advanced 110 yen, or 1.7%, to 6,650, and Toyota Motor, Japan's largest company by value, gained 40 yen, or 0.6%, to 7,100.
Meanwhile, Honda jumped 90 yen, or 2.5%, to 4,170, as Japan's third-largest carmaker increased its full year forecast yesterday for operating profit 9.3% to 820 billion yen, while Shiseido surged 90 yen, or 4%, to 2,370, after the second-largest maker of cosmetics and toiletries increased its profit estimate for this year by 46% to 21 billion yen.
Mitsubishi, which generates the second-biggest proportion of its sales from selling crude and industrial fuel, gained 45 yen, or 2%, to 2,305, while Inpex Holdings, the nation's biggest oil explorer, soared 46,000 yen, or 4.9%, to 980,000, and Nippon Oil, the country's largest refiner, jumped 25 yen, or 2.9%, to 885.
In the US, the Dow Jones Industrial Average climbed 6.8 points, or 0.06%, to 12,134.68, after the Fed left interest rates unchanged at 5.25%.
Altria Group posted the biggest gains with a rise of 2.86% to $82.10, closely followed by heavy equipment maker Caterpillar which gained 1.61% to $61.91, while Exxon Mobil climbed 1.6% to $71.01.
Verizon Communications added 0.79% to $38.30, while Pfizer gained 0.62% to $27.43 although gains were limited by Du Pont which slipped 0.8% to $45.63, while Wal-Mart Stores dropped 0.88% to $50.85.
General Motors was the biggest drag on the index with a fall of 4.09% to $34.71, closely followed by Boeing which dropped 3.27% to $80.86, while communication firm AT&T slipped 1.15% to $34.33.IFAonline
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