* FTSE 100 slips 0.6 pct
* Banks sag on renewed credit worries
* Miners aided by firmer metal prices offer some respite
By Dominic Lau
LONDON, Aug 21 (Reuters) - Britain's FTSE 100 <
> fell 0.6 percent by midday on Thursday as renewed credit jitters hit banking stocks, though miners buoyed by firmer metal prices offered some support.By 1027 GMT, the UK benchmark was down 29.9 points at 5,341.9, after rising 1 percent on Wednesday to snap a three-session losing run.
Banks took nearly 20 points off the index on renewed credit jitters. Barclays <BARC.L>, Royal Bank of Scotland <RBS.L>, HSBC <HSBA.L>, HBOS <HBOS.L>, Lloyds TSB <LLOY.L> and Standard Chartered <STAN.L> shed between 1.3 and 3 percent.
On Wall Street on Wednesday, Fannie Mae <FNM.N> and Freddie Mac <FRE.N> shares plunged to their lowest levels in almost 20 years, while the mortgage companies' bonds rallied on the belief an increasingly likely government bailout would wipe out shareholders but secure their massive debt.
The Financial Times also reported U.S. investment bank Lehman Brothers had held talks on a sale of up to half its shares with China's CITIC Securities as well as with state-owned Korea Development Bank, but both investors walked away saying the price was too high.
CITIC Securities, however, said it had held no formal talks about buying a stake in Lehman. [
]"It's still stemming from the U.S. and worries over there surrounding GSEs (government-sponsored enterprises) are certainly having an effect on the financial stocks over here," said Martin Slaney, head of derivatives at GFT Global Markets.
"It's affecting people's confidence. Today's retail sales figures should have been a boost to the index overall but it hasn't even been a ripple."
British retail sales unexpectedly jumped in July even as prices rose at their fastest rate in a decade, official data showed, calling into question the scale and speed of the consumer slowdown.
Retailers, however, remained in the red but had pared earlier losses, with Marks & Spencer <MKS.L> losing 3 percent, Next <NXT.L> off 0.4 percent and Sainsbury <SBRY.L> dipping 0.8 percent.
Associated British Foods <ABF.L> was down 2 percent after Citigroup cut its price target on the stock and kept its "sell" rating.
MINERS LEND SUPPORT
Mining shares rose on firmer metal prices and after Eurasian Natural Resources <ENRC.L> posted a 160 percent jump in half-year earnings per share on strong metal prices and higher output.
ENRC shares gained 2.8 percent, while BHP Billiton <BLT.L>, Xstrata <XTA.L>, Rio Tinto <RIO.L>, Anglo American <AAL.L> and Kazakhmys <KAZ.L> added between 0.8 and 2.5 percent.
Mid-cap Imperial Energy <IEC.L> advanced nearly 5 percent after India's Business Standard said a government panel has approved India's state-run Oil and Natural Gas Corp's $3 billion bid to buy the Russia-focused oil firm.
Reed Elsevier <REL.L> added 1.3 percent after German publishing house Gruner + Jahr said it was part of a second round of bidders interested in buying the Anglo-Dutch publisher's trade magazines unit. Gruner + Jahr is owned by media group Bertelsmann [
].Mid-cap housebuilder Persimmon <PSN.L> leapt more than 12 percent on short covering after its first-half results were not as bad as some had expected, traders said.
The company reported a 64 percent fall in first-half pretax profit and cut its dividend to 5 pence per share from 18.5 pence, due to very difficult market conditions. Within the sector, Taylor Wimpey <TW.L> soared 4.9 percent and Barratt Developments <BDEV.L> climbed 7.3 percent. (Editing by Sue Thomas)