* FTSE 100 up 0.8 pct * Miners gain ground, gold bounces back
* Legal & General leads insurers higher; banks firmer
By Simon Falush
LONDON, March 23 (Reuters) - Firmer commodity stocks and banks lifted Britain's top share index to a 21-month high on Tuesday, while results from Legal & General <LGEN.L> pushed insurers higher.
By 0952 GMT the FTSE 100 <
> was up 48.77 points at 5,693.31, having hit a high since June 2008 of 5,695.94, after ending down 5.58 points, or 0.1 percent, on Monday.Miners added the bulk of the gains for the blue-chip index, finding support as gold rebounded.
Rio Tinto <RIO.L>, Xstrata <XTA.L>, Lonmin <LMI.L>, Anglo American <AAL.L>, Kazakhmys <KAZ.L> and BHP Billiton <BLT.L> gained 1.7 to 2.2 percent.
"We've had a decent start which is an indication that there is a bias towards equities, with investors seeing more upside," said Peter Dixon, economist at Commerzbank.
"That's interesting for the FTSE given the stiff economic headwinds for the UK economy and the fact we are going into the budget tomorrow."
British annual consumer price inflation slowed last month for the first time since September, dropping more than expected after favourable base effects and a fall in the prices of games and toys, data showed on Tuesday. [
]Legal and General jumped 4.7 percent after it reported profits ahead of analysts' expectations, helped by cost cuts, and said it saw new opportunities this year in spite of subdued economic growth.
Peers Aviva <AV.L>, Prudential <PRU.L>, Standard Life <SL.L> and Old Mutual <OML.L> added 1-1.2 percent.
Elsewhere among financials, banks were also firmer. Barclays <BARC.L>, HSBC <HSBA.L>, Standard Chartered <STAN.L>, Royal Bank of Scotland <RBS.L> and Lloyds Banking Group <LLOY.L> added 0.7-1.5 percent.
Cairn Energy <CNE.L> was the top FTSE 100 gainer, up 9.9 percent after the oil explorer accompanied full-year results with upbeat comments on its operations in India and Greenland, prompting BofA Merrill Lynch to hike its net asset value estimate.
British Airways <BAY.L> climbed 2.9 percent after the airline said its earnings expectations were unchanged as it claimed contingency plans for dealing with a three-day cabin crew strike had been successful.
Home improvement retailers were the biggest losers, with traders saying that a warning from mid-cap Carpetright <CATVU.L> that year to 2010 profit will fall below current market expectations weighed on sentiment for the sector.
Home Retail <HOME.L> and Kingfisher fell 1.5 and 1.1 percent, respectively. Kingfisher reports full-year results on Thursday.
GlaxoSmithKline <GSK.L> fell 0.9 percent after the drugmaker and regulators said on Monday that doctors should temporarily stop using its Rotarix product against a diarrhoea-causing virus called rotavirus because it is contaminated with an apparently harmless pig virus.
BAE Systems <BAES.L> fell 1.2 percent after broker Bernstein downgraded the defence stock to "market perform" from "outperform" citing valuation grounds.
The Confederation of British Industry monthly distributive trades survey is due at 1100 GMT.
Across the Atlantic, February existing home sales will be the main data interest, due at 1400 GMT, with the ABC consumer confidence report not due until after the London market close at 2100 GMT.