* FTSE down 3 percent by midday
* Energy, mining shares fall, tracking commodities prices
* Banks continue to struggle, but Lloyds TSB, RBS gain
By Atul Prakash
LONDON, Oct 16 (Reuters) - Britain's top share index was 3 percent lower at midday on Thursday as mounting concerns of global recession weighed on financials, with commodity shares also under pressure after sharp declines in crude and metals prices.
By 1121 GMT, the FTSE 100 <
> was down 123.3 points at 3,956.3 points, above an earlier low of 3,840.6, after losing 7.2 percent on Wednesday. The index has erased most of the 12 percent rebound seen in the previous two sessions after plummeting 21 percent last week.The benchmark index is down 39 percent so far this year.
The slide in UK stocks followed a fall of more than 11 percent in Japan's Nikkei <
> on Thursday and steep losses in U.S. stocks on Wednesday, the biggest one-day slide since the 1987 market crash, as bleak economic data fed worries the efforts to unlock credit markets may not stave off a severe recession.Energy stocks took most points off the UK index, tracking a 2.5 percent fall in crude that traded around $72 a barrel -- about half the record high seen earlier this year.
BP <BP.L> fell 1.2 percent, Royal Dutch Shell <RDSa.L> lost 4.6 percent, gas producer BG Group <BG.L> shed 1.1 percent and Cairn Energy <CNE.L> lost 0.5 percent.
"At the moment, it's a case of not expecting too much too soon, but may be looking to accumulate investments over a period of time," said Keith Bowman, analyst at Hargreaves Lansdown.
"In theory, now should be a much better time to buy than it was just 18 months ago, but you need not necessarily have to commit all your money in one go ... Recessionary concerns are being built into stocks."
European Union leaders were expected to call on Thursday for action to counter an economic slowdown and support industry amid the worst financial crisis for 80 years, a draft summit statement showed.
The 27 leaders said a forthcoming international summit to reform the global financial system should take early decisions on transparency, global standards of regulation, cross-border supervision and an early warning system to restore confidence.
Banks struggled, with traders taking note of U.S. Federal Reserve Chairman Ben Bernanke's warning of tough times ahead. Barclays <BARC.L>, HBOS <HBOS.L> and Standard Chartered <STAN.L> fell between 2.8 and 6.4 percent.
But shares in Lloyds TSB <LLOY.L> and Royal Bank of Scotland <RBS.L> climbed 3.6 and 1 percent respectively on hopes the government will reverse its decision to ban dividends at banks set to benefit from its 37 billion pound cash injection.
Royal Bank of Scotland was also buoyed by a Financial Times report that private equity firm CVC Capital Partners was in talks to take a controlling stake in the bank's UK insurance assets.
OPTIMISM EVAPORATES
Investors shrugged off recent optimism about massive government efforts to prop up the global financial system.
"Banks are under pressure. We probably can't expect that the banks are going to start to produce good returns any time soon," said Peter Dixon, UK economist at Commerzbank.
"Markets obviously expect a very deep recession on both sides of Atlantic."
Mining stocks fell on the recession sentiment and a drop in metals prices. Copper hit a three-year low before paring losses, while nickel slipped 6 percent and platinum dropped by 4 percent before recovering.
BHP Billiton <BLT.L>, Anglo American <AAL.L>, Vedanta Resources <VED.L>, Lonmin <LMI.L> and Xstrata <XTA.L> all fell between 3.0 and 6.4 percent.
Rio Tinto <RIO.L> was down 5.1 percent. The Daily Telegraph said Aluminium Corp of China was in talks with the liquidators of collapsed bank Lehman Brothers <LEHMQ.PK> to free up billions of dollars in shares Chinalco owns in miner Rio Tinto.
Tour operator TUI Travel <TT.L> was the biggest decliner. It shed 22.4 percent after Germany's TUI AG <TUIGn.DE> said it did not intend for now to make an offer for TUI Travel.
Legal and General Group <LGEN.L> fell 3.5 percent after the company said it remained cautious about the economic outlook, but was confident that it was well positioned to exploit opportunities throughout the current economic cycle. (Editing by Quentin Bryar)