* FTSE 100 falls 5.4 percent
* Banks knocked by uncertainty on European financial sector
* Miners, oils hit by falling crude, metals prices
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By Simon Falush
LONDON, Oct 6 (Reuters) - Britain's top share index tumbled 5.4 percent by midday on Monday, with banking and mining stocks hammered as officials across the globe scrambled to contain the fallout from the escalating crisis in financial markets.
By 1035 GMT the FTSE 100 <
> was down 275.2 points at 4,705.2 after losing 2.1 percent last week, though it recovered slightly after briefly falling to its lowest level in nearly four years.No stock was in positive territory on the UK benchmark index.
Banks were among the biggest fallers with Barclays <BARC.L>, Royal Bank of Scotland <RBS.L> and HBOS <HBOS.L> down between 11.8 and 15.5 percent.
The UK finance minister said Britain is looking at all options on the financial crisis and that it is prepared to take radical action where it is needed.
The Financial Times said Alistair Darling was considering a taxpayer-funded recapitalisation of Britain's banks, amid signs of cross-party and central bank support for an effective part-nationalisation of the sector.
More European governments followed Germany's lead offering blanket deposit guarantees to savers as German authorities clinched a deal to rescue lender Hypo Real Estate <HRXG.DE> at the second time of asking.
"We thought the market was going to start lower after U.S. markets ended lower (on Friday) and that's been compounded by issues surrounding the German economy," said Neil Parker, market strategist at RBS. "No one's certain on what's been agreed and what hasn't so there's a lot of confusion out there."
BAILOUT BLUES
Investors were also concerned whether a $700 billion bailout package agreed last week from the United States would be big enough to prevent a global recession.
"The (U.S.) bailout has gone through but there are concerns about how it's going to be implemented and with European banks also in trouble, it's playing on investor jitters," Richard Hunter, head of UK equities at Hargreaves Lansdown said.
Other financial stocks were also hit, with interdealer broker ICAP <IAP.L> down 3.3 percent, hedge fund Man Group <EMG.L> shedding 10 percent and insurers Old Mutual <OML.L> and Prudential <PRU.L> falling 6.5 and 10.6 percent respectively.
Mining stocks were hit by falling metals prices on fears that the financial crisis would lead to a wider economic slowdown and shrink demand.
Kazakhmys <KAZ.L> and Eurasian Natural Resources <ENRC.L> were the index's biggest fallers, down 19.4 and 17.1 percen, while Xstrata <XTA.L>, BHP Billiton <BLT.L>, Rio Tinto <RIO.L> and Anglo American <ALL.L> fell between 8.9 and 11.4 percent.
"Governments are making progress in sorting out problems in the banking sector, but there's a growing realisation that they are not in a position to deal with the economic slowdown that's coming," said Graham Neale, director at stockbroker Killik & Co.
Energy companies were hit by falls of more than $3 in crude prices <CLc1> below $91, with BP <BP.L> down 5.4 percent Royal Dutch Shell <RDSa.L> losing 5.7 percent and Cairn Energy <CNE.L> falling 10.8 percent.
British Airways <BAY.L>, which often benefits from lower fuel prices, fell 9.7 percent as the market continues to be pessimistic on the outlook for airlines following the flag carrier's report of a 9 percent fall in September premium traffic.
Retailers were also pressured, with the Financial Times quoting the country's largest corporate insolvency specialist Begbies Traynor as saying a large number of UK retailers could go bust in the new year.
Marks & Spencer <MKS.L> fell 2.3 percent, Next <NXT.L> shed 5.7 percent and Kingfisher <KGF.L> was down 3.4 percent. (Editing by David Cowell)