* FTSE 100 down 1.5 pct, touches three-year low
* UK jobless claims post biggest rise since 1992
* Banks the heaviest drag on the market
* Wolseley falls after weak results, outlook
By Dominic Lau
LONDON, July 16 (Reuters) - Britain's top share index fell 1.5 percent by midday on Wednesday, touching a three-year low, as Royal Bank of Scotland <RBS.L> and HBOS <HBOS.L> led banks lower on deepening concerns over the sector.
By 1022 GMT, the FTSE 100 <
> was down 75.8 points at 5,096.1 after trading as much as 0.7 percent higher earlier in the session. European shares also traded lower.The UK benchmark index fell 2.4 percent on Tuesday to hit its lowest close since October 2005. It has lost 21 percent so far this year.
"People are looking ahead as to what writedowns they are going to see from JPMorgan <JPM.N> and Citi <C.N> when they come out in the next few days and so on. People are just generally concerned," said Stephen Pope, chief global market strategist at Cantor Fitzgerald Europe.
"Until they start to feel there is any stability in the banking system and writedowns are being sufficiently announced, then it is not going to have any confidence to move forward," he said, adding that higher UK unemployment claims added to the gloom.
Banks remained under pressure, with Royal Bank of Scotland shares sagging 8.1 percent to a 10 year low as concerns deepened about earnings for its big U.S. unit Citizens, revenues at its enlarged investment bank arm and the potential that more capital will be needed if it struggled to sell its insurance arm.
HBOS <HBOS.L>, Barclays <BARC.L>, Standard Chartered <STAN.L>, Lloyds TSB <LLOY.L> and HSBC <HSBA.L> were down between 1.5 and 8.5 percent.
On Tuesday, U.S. securities regulators issued an emergency rule to limit certain types of short selling in major financial firms, including Fannie Mae <FNM.N> and Freddie Mac <FRE.N>. [
]Index heavyweight oil shares gave up early gains and turned negative. BP <BP.L>, Royal Dutch Shell <RDSa.L>, gas producer BG Group <BG.L>, Cairn Energy <CNE.L> and Tullow Oil <TLW.L> slipped 0.9 to 1.6 percent.
Investors will look U.S. consumer prices data, due at 1230 GMT, for more clarity on the inflation picture in the world's largest economy.
In Britain, the number of people out of work and claiming benefits rose for a fifth month running in June and by the largest amount since the slump of the early 1990s, in a sign the economic slowdown is starting to bite.
GLOOMY WOLSELEY
Wolseley <WOS.L> dropped 7.2 percent after the building materials distributor said trading profit for the last 11 months was down 28 percent and market conditions were likely to continue deteriorating. [
]Admiral Group <ADML.L> rose 4.3 percent to top FTSE 100 gainers as UBS cited positive data from the AA on UK motor insurance premium rates as a good reason to buy the car insurer.
ICAP <IAP.L> climbed 3.8 percent after the world's biggest interdealer broker said group revenue grew by 15 percent in the first quarter and it expected year profit to be broadly in line with market expectations. [
]London Stock Exchange <LSE.L>, British Land <BLND.L>, FirstGroup <FGP.L> and Man Group <EMG.L> all fell after going ex-dividend.
Credit Suisse, meanwhile, raised UK stocks to 5 percent overweight from benchmark in its global portfolio, while continental Europe was 30 percent underweight.
"The UK will have a recession but just 10 percent of the stock market is accounted for by domestic cyclicals," the broker said in a note. "Relative earnings momentum is second best of all regions. UK equities tend to outperform 70 percent of the time when global equities and lead indicators are weak." (Additional reporting by Michael Taylor)