By Michael Taylor
LONDON, April 16 (Reuters) - Britain's top shares clung onto earlier gains in volatile trade on Wednesday as banks were buoyed by signs the Bank of England was close to finalising the terms for mortgage intervention, and bid talk and metal prices boosted miners.
At 1031 GMT the FTSE 100 <
> was up 40.1 points, or 0.7 percent at 5,947.0 after touching a high of 5,964.6.Banks rose after the Financial Times said the UK central bank was close to finalising the terms for an intervention in the mortgage market.
The newspaper, citing people familiar with the proposal, said the plan would see the Bank of England swap UK mortgage-backed securities for government loans for a period of one to three years. [
]Barclays <BARC.L>, Royal Bank of Scotland <RBS.L>, HBOS <HBOS.L>, HSBC <HSBA.L>, Lloyds TSB <LLOY.L> and Alliance & Leicester <ALLL.L> were up between 0.2 and 3.6 percent.
"Supporting is the banks, which have come back to life ahead of the U.S. earnings," said Jawaid Afsar, a trader at Securequity in Sheffield. "People are optimistic that while a lot of the bad news is still to come through, much of it is priced in."
"That (BoE plan) may also be spurring it because the banks have certainly had a raw deal over the past few months."
Among other sectors, Rio Tinto <RIO.L> rose 3.4 percent to feature among the leading blue-chip gainers, as traders cited talk of an increased bid from rival BHP Billiton <BLT.L> <BHP.AX>.
BHP, whose shares gained 1.9 percent, declined to comment, while Rio <RIO.AX> was not immediately available for comment.
Rio has rejected BHP's proposed 3.4 shares for one share swap, preferring to ride the mineral boom on its own.
Rio also posted a mixed first-quarter production report and said it is racing to meet rising global commodities demand, brushing aside fears that a U.S. recession would damage the mining sector.
Climbing metal prices also supported the sector, said traders, with Lonmin <LMI.L, Xstrata <XTA.L>, Vedanta <VED.L> and Anglo American <AAL.L> up between 1.2 and 3.6 percent.
In other gainers, credit information provider Experian <EXPN.L> leapt 9 percent after it said second-half sales rose 2 percent, slightly ahead of forecasts.
JPMorgan's <JPM.N> first-quarter earnings will provide further market direction later and offer some clarity on the strength of U.S. banks amid the credit crisis.
The Wall Street Journal quoted a person familiar with the matter as saying on Wednesday that Merrill Lynch <MER.N> would announce a further $6 billion to $8 billion of asset writedowns in its quarterly results on Thursday.
"In order to say that we are out of the woods, the FTSE has to break above 6,000 points," said Securequity's Afsar. "Why the market is where it is at the present time, I'm struggling to come up with any valid reasons."
Investors will also look to U.S. consumer inflation and housing starts data due at 1230 GMT for further clues of the health of the world's biggest economy.
In Britain, about 25 billion pounds of consumer debt was "problem debt" that people were struggling to repay, the Financial Times said, quoting a new study by TDX Group, a provider of debt management.
SLICK OILS
Oil stocks edged higher as U.S. crude <CLc1> hit a new high above $114 a barrel. BP <BP.L> tacked on 0.3 percent while rival Shell <RDSa.L> climbed 0.9 percent.
On the downside, shares in Britain's third-largest life insurer Legal & General <LGEN.L> slipped 4.6 percent to top FTSE 100 losers as traders pointed to disappointment at their first quarter results and the stock trading ex-dividend.
L&G posted broadly flat first-quarter sales, beating expectations as growth in corporate annuities and a tie-up with building society Nationwide offset weakening market conditions.
BAE Systems <BAES.L>, Friends Provident <FP.L>, Kingfisher <KGF.L> and Smith & Nephew <SN.L> all fell after going ex-dividend. (Additional reporting by Dominic Lau; Editing by Quentin Bryar)