* Energy stocks weak, tracking lower crude prices
* Marks & Spencer falls after warns of tough 2010 * Food and general retailers under pressure
By Harpreet Bhal
LONDON, Jan 6 (Reuters) - Britain's leading shares were down 0.3 percent around midday on Wednesday as energy stocks mirrored weakness in crude prices, while retailer Marks & Spencer was the standout faller after a disappointing trading update.
At 1149 GMT, the benchmark FTSE 100 <
> index had shed 14.34 points to 5,508.16, reversing early gains made after hitting its highest closing level in 16 months on Tuesday at 5,522.50.Energy stocks were the biggest drag on the index as a rally in crude prices faltered <CLc1>. BG Group <BG.L>, BP <BP.L>, Royal Dutch Shell <RDSa.L> and Cairn Energy <CNE.L> fell between 0.5 and 0.8 percent.
Analysts also attributed falls on the index to jitters ahead of key economic data set for release this week, including the U.S. non-farm payrolls data on Friday and the Bank of England policy decision on Thursday.
"What we have seen is simple profit taking as a precaution, with the markets entering into a raft of crucial economic data over the next three days," said Joshua Raymond, market strategist at City Index.
Marks & Spencer fell 4.9 percent after it posted its first rise in quarterly underlying sales for over two years but missed analysts' forecasts and joined rivals in warning of an uncertain 2010. [
]Within the retail sector, Home Retail <HOME.L> and Kingfisher <KGF.L> were down 0.6 and 0.9 percent, respectively, while Next <NXT.L> edged up 0.1 percent.
Food retailers were also lower. Sainsbury <SBRY.L>, which releases a trading update on Thursday, dropped 1.1 percent, while peers Tesco <TSCO.L> and Wm Morrison <MRW.L> shed 1.6 and 0.7 percent. A ratings downgrade by brokers Jefferies also weighed on Tesco.
CONFIDENCE DENTED
The Nationwide Building Society's consumer confidence index fell to 69 from an upwardly revised 74 in November, after respondents sharply scaled back their expectations for the coming year. [
]Meanwhile, British service sector activity accelerated slightly in December after the strongest growth in new orders since September 2007, but firms also faced rising costs, a survey of purchasing managers showed on Wednesday. [
]Later in the session, U.S. ADP National Employment figures for December, due at 1315 GMT, will be a focus ahead of Friday's non-farm payrolls data.
Among sector gainers were defensive tobacco firms, with British American Tobacco <BATS.L> and Imperial Tobacco <IMT.L> up 0.4 and 0.5 percent, respectively. BAT also benefited from an upgrade by Nomura to "buy" from "reduce".
Other defensive firms, which benefit from a perceived safe-haven appeal, also gained, with BT Group <BT.L> up 1.6 percent and mobile telecommunications firm Vodafone <VOD.L> ahead 0.2 percent.
Autonomy Corp <AUTN.L> rose 2.1 percent, as the IT firm said it expected to report in-line 2009 full-year results and saw strong cash collection in the fourth quarter. [
]ICAP <IAP.L> and Burberry <BRBY.L> were in negative territory after going ex-dividend. (Reporting by Harpreet Bhal, editing by Will Waterman)