* FTSE 100 down 1.5 pct, reverses Wednesday's gains
* Banks and oils pull down index
* BoE interest rate verdict eyed
By Michael Taylor
LONDON, July 10 (Reuters) - Britain's blue-chip index shed 1.5 percent by midday on Thursday, as investors tracked a large slide in U.S. markets overnight and as oil and banking stocks weighed ahead of a Bank of England interest rate decision.
At 1030 GMT the FTSE 100 <
> was down 85.0 points, or 1.5 percent at 5,444.6, reversing the 1.6 percent rise in the previous session. Britain's biggest trading index is now down 15.5 percent for the year.Beaten-down banks weighed on the FTSE 100, with Barclays <BARC.L>, HSBC <HSBA.L>, Royal Bank of Scotland <RBS.L> and Lloyds TSB <LLOY.L> down 0.5-3.3 percent.
U.S. markets tumbled overnight, with shares in Fannie Mae <FNM.N> and Freddie Mac <FRE.N> slumping as investors feared the two pillars of the U.S. housing market would have to raise billions through share sales. Merrill Lynch <MER.N> fell after credit-rating agency Fitch said it may cut the bank's debt rating.
Heavyweight oil shares also lost ground, as U.S. crude <CLc1> steadied at under $136 a barrel, off recent record highs. BP <BP.L>, Royal Dutch Shell <RDSa.L> and BG Group <BG.L> shed 1.4-2.3 percent.
"It was a short reprieve yesterday," said Manus Cranny at MF Global Spreads. "The biggest issue is financials again today. A very difficult opening, a very difficult market."
"The only thing that might draw some (further) reprieve is that oil may turn lower, and if that happens it will really help all of the central banks ... It will withdraw that inflationary fear we have, which potentially leads to higher rates.
"The BoE has absolutely no option but to leave rates unchanged. With the economy in a fairly parlous state, they don't have the ability to raise rates," he said.
The BoE will announce its verdict at 1100 GMT, with analysts expecting the central bank rates to hold its key interest rate steady at 5 percent.
EXPERIAN TOPS GAINERS
Among companies with trading updates, credit information firm Experian <EXPN.L> was one of the few FTSE 100 stocks trading in positive territory.
Experian added 4.6 percent to top the FTSE 100 leaderboard after it posted a 1 percent rise in first-quarter revenues as acquisitions helped it beat forecasts that revenue would shrink due to continued U.S. weakness. [
]Also on the upside, midcap Barratt Developments <BDEV.L> rose 9.7 percent after it said it was to cut 1,200 jobs to cope with the downturn in the housing market and would not pay a final dividend for 2007-08. [
]The housebuilder also said it had agreed a restructuring of covenants with banks and private placement note providers "well in advance, as an appropriate, prudent response to current market conditions".
Rival builder Taylor Wimpey <TW.L> gained 9.1 percent.
Britain's biggest commercial broadcaster ITV <ITV.L> lost 5.8 percent to 40.5 pence after analysts at UBS predicted a sharp deterioration in the UK TV advertising market in September.
Retailer Kingfisher <KGF.L> dipped 5.7 percent after Goldman Sachs cut its price target and added the company to its "conviction sell list".
London Stock Exchange <LSE.L> fell 2.2 percent, paring some of its 10 percent gain on Wednesday, when it said first-quarter revenue rose 8 percent to 178 million pounds.
Among other midcaps, F&C Asset Management <FCAM.L> plummeted 20.6 percent on talk that its second biggest shareholder, investment firm Dawnay Day, was selling most of its stake in the company, market sources said. [
]"We are in a bear market, that is accepted," said Howard Wheeldon, senior strategist at BGC Partners. "It is rare to see such frenetic day-to-day gyrations of volatility."
"We are now into a period of intense nervousness ahead of the second quarter (earnings). It can only get worse before it gets better but for all that I think we're getting close to the bottom." (Additional reporting by Dominic Lau and Atul Prakash; Editing by Quentin Bryar)