* FTSE down 0.3 pct, geopolitical concerns linger
* Energy stocks gain, oil could peak at $220 - analysts
* Banks lower, RBS results disappoint
* FTSE volatility index up over 40 pct this week
By David Brett
LONDON, Feb 24 (Reuters) - Upbeat comment from BP on its activities in India added to a rebound in energy stocks, but Britain's top share index remained hamstrung on Thursday by the ongoing troubles sweeping the Middle East and North Africa.
BP's <BP.L> Indian head, Sashi Mukundan, estimates there are 15 trillion cubic feet of gas resources in the 23 blocks it has bought into in its $7.2 billion deal with Reliance Industries <RELI.BO> and there could be more. [
]"The BP/Reliance deal is spectacularly positive and shows a major commitment to India and makes energy capital in India look more attractive," Daniel Slater, analyst at Arden Partners says.
BP gained 1.0 percent on the news, which helped spark a 3.2 percent rally in oil explorer Cairn Energy <CNE.L>.
Cairn Energy, which has blocks in India, is currently trying to sell a majority stake in its Indian arm Cairn India <CAIL.BO> to Vedanta Resources <VED.L>.
Energy stocks were the major ray of light on an index currently under a cloud of geopolitical troubles.
By 1138 GMT, the FTSE 100 <
> was down 15.20 points, or 0.3 percent, at 5,908.33, anchored below seven-month technical support level of 5,920.London's blue chip index has shed near 3 percent on the week, as the price of oil has hit multi-year highs, threatening to derail the global economic recovery.
Brent crude <LCOc1> surged to its highest price since August 2008 on concern the bloody unrest that has cut more than a quarter of OPEC member Libya's output could spread to other producers, including top exporter Saudi Arabia.
"The closest comparison to the current MENA unrest is the 1990-91 Gulf War. If Libya and Algeria were to halt oil production together, prices could peak above $220 a barrel," Nomura said in a note.
BANKS
Risk-sensitive banks <.FTNMX8350>, were the major fallers, down sharply as investors looked uneasily at the unrest in the Middle East and North Africa.
RBS <RBS.L> came off worst, down 3.8 percent, as its results were met with disappointment. [
]Bad debts from Ireland, an uninspiring investment banking performance and lack of dividend put pressure on the shares, traders said.
Lloyds Banking Group <LLOY.L> were 1.4 percent lower ahead of results on Friday.
British American Tobacco <BATS.L> fell 2.0 percent, after the maker of Kent, Dunhill, Lucky Strike and Pall Mall cigarettes reported full-year results. [
]"(The numbers) all looked in line, the dividend was slighter better than expected and (it announced) a 750 million pound buyback but the market expected 1 billion so that was a little disappointing," Alwyn Phillips, a trader at IG Index, said.
GKN <GKN.L> shed 2.3 percent after Citigroup cut its rating for the automotive and aerospace parts group to "hold" from "buy" ahead of upcoming full-year results.
"We sense a pause in the pace of its (GKN's) recent rapid profit rise," Citigroup says in a note.
Capita <CPI.L> was the star FTSE 100 performer, up 7.8 percent, as investors cheered the outsourcing group's full-year results.
"(We expect) the valuation (to) revert from the current, historically low level to at least the high-teens price earnings that a company of this quality deserves," Peel Hunt said.
Peer Serco <SRP.L> added 2.5 percent. (Additional reporting by Simon Falush; Editing by Jon Loades-Carter)