* Steepest one-day decline in six weeks
* Miners biggest fallers, hurt by weaker metals prices
* Banks hit by Greek debt fears
By Tricia Wright
LONDON, April 8 (Reuters) - Britain's top share index posted its steepest one-day decline in six weeks on Thursday, pressured by miners hit by weaker metals prices, and banks on revived concern over Greece's debt.
The FTSE 100 <
> closed 49.36 points, or 0.9 percent, lower at 5,712.70, its lowest close since March 31, after it shed 0.3 percent on Wednesday."Obviously Greece is still on everyone's mind because that hasn't been sorted out, and weak commodity stocks, which obviously have a very big weight on the FTSE, are going to pull the index down," said Mark Priest, senior equities trader at ETX Capital.
Miners took the most points off the index, with Xstrata <XTA.L>, Eurasian Natural Resources <ENRC.L> and Kazakhmys <KAZ.L> the worst off, dropping 2.9 to 3.8 percent.
It was a similar story with energy stocks which fell as crude prices <CLc1> were hurt by the stronger dollar and a rise in U.S. crude stockpiles to their highest level in nearly 10 months.
BP <BP.L>, Cairn Energy <CNE.L> and Royal Dutch Shell <RDSa.L> slipped 0.3 to 0.8 percent.
Disappointing U.S. jobless claims data also affected market sentiment. Initial claims for state unemployment benefits unexpectedly rose 18,000 to 460,000, the Labor Department said. Economists expected claims to edge down to 435,000.
Markets pounded Greek bonds and banking stocks on Thursday, driving the debt-stricken euro zone member's borrowing costs to new highs and pushing it closer to tapping a last resort EU/IMF safety net. [
]Risk sensitive UK bank stocks fell, with Barclays <BARC.L>, HSBC <HSBA.L>, Lloyds Banking Group <LLOY.L>, Royal Bank of Scotland <RBS.L> and Standard Chartered <STAN.L> off 0.1 to 3 percent.
As expected, the Bank of England kept interest rates at a record low of 0.5 percent and made no increase to its 200 billion pound asset-buying scheme to boost the economy, and the European Central Bank left rates unchanged. [
] [ ]"The Bank of England result has no bearing at all on the fact we are down, it is more we are in a period of consolidation," said Andrew Bell, chief executive of the Witan Investment Trust.
"People think we need a pause for breath rather than chasing the market after a 10 percent rally since a low in February."
British Airways <BAY.L> was a bright spot in an otherwise gloomy day, adding 2.9 percent and topping the blue-chip leader board. BA and Spain's Iberia <IBLA.MC> signed an $8 billion merger to create the world's third-largest airline, bringing a three-way tie-up with American Airlines <AMR.N> a step closer. (Additional reporting by Simon Falush; editing by Simon Jessop)