* FTSE 100 sheds 3.1 pct by midday
* Commodity stocks fall on mounting recession fears
* Banks remain weak; HSBC, StanChart down
(For more on the financial turmoil, click on [
])By Dominic Lau
LONDON, Oct 15 (Reuters) - Britain's leading shares fell 3.1 percent by midday on Wednesday, ending a two-day recovery run, as commodity stocks and banks tumbled on growing fears of a global recession.
By 1033 GMT, the FTSE 100 <
> was down 136.8 points at 4,257.4. The UK benchmark rebounded nearly 12 percent in the previous two sessions after plummeting 21 percent last week -- its second worst weekly fall ever.Miners were big losers, as base metal prices slipped and after Rio Tinto <RIO.L> warned of slowing Chinese demand for commodities because of the world financial crisis and signalled a possible delay in plans to sell $10 billion in assets.
Rio Tinto plunged 10.9 percent, BHP Billiton <BLT.L> shed 10.4 percent, Anglo American <AAL.L> sank 14.2 percent, Xstrata <XTA.L> slumped 16.1 percent and Eurasian Natural Resources <ENRC.L> sagged 12.5 percent.
Weaker crude prices weighed on energy stocks, with BP <BP.L>, Royal Dutch Shell <RDSa.L>, BG Group <BG.L> and Cairn Energy <CNE.L> dropping between 1.7 and 5.4 percent.
"Today is one of those days that is indicating we are not at the end of a bear market," said Angus Campbell, head of sales at Capital Spreads.
"There are still recessionary fears. There are still fears about the global outlook for equities. You would get big, big rises after big, big falls but the big, big rises won't be able to cancel out all the falls that we see for quite a while."
Banks were other standout losers, with the FTSE 350 banks index <.FTNMX8350> down 2.4 percent. HSBC <HSBA.L>, HBOS <HBOS.L> and Standard Chartered <STAN.L> lost between 0.4 and 8.3 percent.
But Lloyds TSB <LLOY.L> rose 6.4 percent after the Independent said the government was considering a U-turn that would allow the bank to pay dividends to shareholders while still taking advantage of its 37 billion pounds bank bailout scheme.
Barclays <BARC.L> and Royal Bank of Scotland <RBS.L> added 2.1 and 0.8 percent, respectively.
Results from U.S. bank JPMorgan <JPM.N> later in the day will give further clues on the state of the crisis-hit sector.
Insurers languished after the Times said the Financial Services Authority had stepped up its scrutiny of leading life assurers amid concerns that crumbling investment markets are putting their solvency levels under pressure.
Prudential <PRU.L>, Old Mutual <OML.L>, Aviva <AV.L>, Friends Provident <FP.L> and Standard Life <SL.L> fell between 3.6 and 7.8 percent. Friends Provident also traded ex-dividend.
RECESSION FEARS MOUNT
British unemployment posted its biggest rise in 17 years in the three months to August as the jobless rate rose to its highest level in eight years. [
]U.S. producer prices and retail sales data, due at 1230 GMT, will provide a further gauge to the health of the U.S. economy.
"While we may overcome the immediate financial crisis ... you have got the broader economy to consider. Things are not looking so cheerful," said Tim Hughes, head of sales trading at IG Index. "The broader global economy is still incredibly precarious and facing some huge challenges going forward."
Experian <EXPN.L> shed 6.7 percent after the credit checking firm reported a 13 percent rise in first-half revenue, and said it had decided not to sell its price comparison Web site, Pricegrabber, as potential buyers were unlikely to be able to finance acceptable offers in current market conditions.
British Land <BLND.L> and Smith & Nephew <SN.L> also fell after going ex-dividend.
Autonomy <AUTN.L> climbed 3.9 percent after the software group beat market expectations by posting adjusted pretax profit of $53.7 million for the third quarter, and said it was "confident" about its outlook. (Editing by Paul Bolding)