* Commodities gain; demand outlook lifted by China data
* Banks weak; Barclays down on potential U.S. interest
* Defensive drugs, tobacco, food retailers weak
By David Brett
LONDON, March 10 (Reuters) - Britain's top share index was up 0.1 percent in midday trade on Wednesday, as strength in commodities, supported by trade data from China, outpaced weakness in banks and defensive issues.
By 1215 GMT, the FTSE 100 <
> was up 4.81 points at 5,607.11, having closed 0.1 percent lower on Tuesday.The index remains near its 18-month high and around 60 percent above levels a year ago when the market hit a trough.
"After the run that we have had the market ... You can naturally expect a bit of a pullback but it is proving to be resilient," said Paul Kavanagh, partner at Killik & Co.
Miners were in demand as copper prices rose after data showing Chinese exports and imports grew faster than expected in February raised hopes for a global economic recovery. [
]Among the best performers, Randgold Resources <RRS.L>, Lonmin <LMI.L>, Rio Tinto <RIO.L> and Fresnillo <FRES.L> added 1.8-2.3 percent.
Oil majors gained as crude prices <CLc1> held around $82 a barrel, with Royal Dutch Shell <RDSa.L>, BG Group <BG.L>, BP <BP.L> and Cairn Energy <CNE.L> 0.3-0.9 percent higher.
But oil explorer Tullow Oil <TLW.L> shed 0.6 percent after saying 2009 net profit fell 92 percent.
Banks were weaker, however, dragged back by a turnaround from heavyweight HSBC <.HSBA.L>, down 0.1 percent, while Standard Chartered <STAN.L> fell 1.3 percent.
Barclays <BARC.L> fell 1.1 percent. The bank is looking to buy a retail bank in the United States to extend its presence after buying Lehman Brothers' North American operations in 2008, the Wall Street Journal reported.
But part-nationalised lenders Royal Bank of Scotland <RBS.L> and Lloyds Banking Group <LLOY.L> held firm, up 2.6 percent and 1.9 percent respectively. Among individual risers, ICAP <IAP.L>, the world's biggest interdealer broker, was the top FTSE 100 gainer, up 4 percent after mid-cap peer Tullet Prebon <TLPR.L>, ahead 21 percent, confirmed it was in bid talks.
DEFENSIVES DRAG
British American Tobacco <BATS.L> was the single biggest faller on the FTSE 100, down 4 percent with the stock trading ex-dividend.
Overall ex-dividend factors knocked 8.65 points off the FTSE 100 index on Wednesday, with Admiral <ADML.L>, Schroders <SDR.L>, Serco Group <SRP.L>, Shire <SHP.L>, Standard Chartered <STAN.L> and TUI Travel <TT.L> also losing dividend attractions.
Other defensively-perceived stocks were also weaker, led by drugmakers, AstraZeneca <AZN.L> and GlaxoSmithKline <GSK.L>, off 0.2 percent and 0.8 percent respectively.
Food retailer Wm Morrison Supermarket <MRW.L> lost 0.5 percent, ahead of results due on Thursday. Peers Tesco <TSCO.L> and Sainsbury <SBRY.L> each fell 0.6 percent.
Sterling skidded to one-week lows against the dollar and euro on Wednesday after data showing an unexpected fall in manufacturing hit a market already reeling from political and economic worries.
British manufacturing output fell in January at its sharpest monthly rate since last August, after a strong December and poor weather in the month. [
] (Editing by Dan Lalor)