By Raissa Kasolowsky
LONDON, Feb 13 (Reuters) - Britain's leading share index fell more than 1 percent on Wednesday, led by falls in mining and oil companies, while some investors reassessed Warren Buffett's plan to help troubled bond insurers.
At 1228 GMT, the FTSE 100 index <
> was 1.1 percent at 5,846.1, as oil produces such as BP <BP.L> and Royal Dutch Shell <RDSa.L> lost ground.The FTSE surged 3.5 percent on Tuesday after billionaire investor Buffett offered to reinsure $800 billion worth of debt guaranteed by bond insurers.
But investors were divided on what to make of the move, with some sceptical that it would help troubled bond insurers and areas of the credit market besides municipal bonds.
This rethinking put pressure on banks such as Alliance & Leicester <ALLL.L>, Barclays <BARC.L> and HBOS <HBOS.L> which fell between 1.9 and 4.5 percent.
Fuelling fears over the fall-out of the credit crisis, British specialist mortgage lender Bradford & Bingley <BB.L> took a 94 million pound ($184 million) write-down on its exposure to tarnished assets. The stock tumbled more than 14 percent.
"We have been living underneath this shadow of the credit crisis and we have been surprised day after day by various banks owning up to bigger and bigger losses," Edward Menashy, an economist at Charles Stanley said.
The concerns may have been heightened after Japan's financial regulator said the country's financial firms held about $14 billion worth of subprime-related investments at the end of December.
Northern Rock <NRK.L>, which has been the biggest victim of the credit crisis, fell 5.7 percent. Two suitors competing to rescue the ailing lender have been told to improve their offers to beat the alternative of nationalisation, sources familiar with the matter said.
BUFFETT OFFER
After pushing stock markets higher in the previous session, investors now wondered how beneficial Buffett's offer would be for bond insurers.
"Far from being the miracle cure, the Buffett plan cherry picks out the most worthwhile parts of the monoline business, leaving them (banks) with all the toxic waste," Societe Generale said in a note.
But Menashy said his move showed the current situation was not beyond repair: "Buffett is not the kind of man that would take on a dead loser and so therefore (the fact) that he initiated a move goes to show that if the financial institutions got together they can actually solve this problem."
The market showed little reaction to forecasts by the Bank of England that inflation was likely to overshoot the central bank's 2 percent target.
This, coming on the back of recent data showing price pressures are still building, could limit the scope for monetary easing for Britain's central bank.
A downbeat overall market and lower metal prices hurt miners across the board, with Rio Tinto <RIO.L>, BHP Billiton <BLT.L>, Vedanta <VED.L>, Anglo American <AAL.L>, and Lonmin <LMI.L> down between 1.3 and 4.3 percent.
The losses came even as global miner Rio Tinto <RIO.L> posted a 9 percent rise in half-year underlying profit, boosted by record iron ore production.
Nuclear power generator British Energy <BGY.L> climbed 8.1 percent making it the best performer on the FTSE as traders said its results were better than expected.
The company said it was looking at four designs for the next generation of nuclear power stations in Britain, as it posted a 4 percent fall in core earnings in its first nine months.
(Editing by Richard Hubbard)