Backed by oil firms, the FTSE has made a positive start to the day climbing 50 points, or 0.82%, to 6182.2.
BG Group was the fastest starter, jumping 22p to 772p. It was closely followed by Royal Dutch Shell B, up 40 points, or 2.15%, to £18.98, and Royal Dutch Shell A, up 38p, or 2.05%, to £18.93.
However, early gains are being stemmed by losses for DSG International, down 3.2p, or 2.03%, to 154.1p, Standard Life, down two points, or 0.69%, to 288.5p, and Home Retail, down two points, or 0.49%, to 409.5p.
In the US, the Dow Jones had one of its strongest days in weeks as it climbed 247.44 points, or 1.9%, to close on 13289.29.
The market recorded no losers but huge winners, including for GEN Motors, up 1.41 points, or 4.83%, to 30.59.
Other notable winners were Intel Corporation, up 1.13 points, or 4.72%, to 25.09, and Home Depot, up 1.5 points, or 4.28%, to 36.55.
In Japan, the Nikkei 225 rose 140.99, or 0.9%, to 16,153.82 at the close of trading in Tokyo.
Nintendo, maker of the top-selling Wii game console, jumped 1,300 yen, or 2.5%, to 53,300 in Osaka.
Isuzu Motors Ltd, Japan's third-biggest maker of commercial vehicles, climbed 14 yen, or 2.3%, to 612, and Sony Corp, the world's second-biggest consumer electronics maker, advanced 60 yen, or 1.2%, to 5,290.
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