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(Noon): Mining shares pulled the market higher after a rise in the price of some metals and a well-received trading update from Anglo American.
Shares in Anglo American rose 3% after it reported a rise in output during the first quarter of the year.
In lunchtime trade, the FTSE 100 was up 38.93 points, or 0.6%, at 6,282.60.
William Hill climbed 4.7% after the bookmaker said it had enjoyed a strong start to 2013, with net revenue up 15% and operating profit 8% higher.
The firm said more sporting bets were made online than in its betting shops, with an increasing number placed through its mobile apps.
Shares in GlaxoSmithKline were unchanged after the Office of Fair Trading accused it of paying firms to delay the launch of cheaper versions of an antidepressant treatment. In a statement, Glaxo said it "very strongly believe that we acted within the law".
Shares in airline Flybe fell by one pence to 41p after the carrier said revenue growth for the past financial year was at the lower end of expectations.
On the currency markets, the pound was up 0.4% against the dollar at $1.5345 and was 0.1% higher against the euro at 1.1725 euros.