* FTSE turns positive, up 0.7 percent by mid-session
* Citigroup results help banks rally further
* Miners, oil stocks cap gains
By Rebekah Curtis
LONDON, July 18 (Reuters) - British blue-chip stocks were hight at midday on Friday, reversing early losses as better than expected results from U.S. bank Citigroup added steam to a rally in banks and offset weakness in commodity stocks.
By 1115 GMT the FTSE 100 <
> was up 36.5 points, or 0.7 percent, at 5,322.8 points. The index closed up 2.6 percent on Thursday, when a surge in battered banks was fuelled largely by better than expected results from JP Morgan <JPM.N>.U.S. stock futures also reversed an earlier slide and rose after the results from Citigroup. The largest U.S. bank posted a smaller than expected $2.5 billion second-quarter loss, suffering writedowns and credit losses tied to deteriorating credit markets and the slumping economy.
The net loss was 54 cents per share and compared with a year-earlier profit of $1.24 per share, or $6.23 billion.
"The net share loss ... is coming in better than consensus," said Martin Slaney, head of derivatives, at GFT Global Makets.
"Things aren't as bad as (they had) been priced in. It's going to help UK banks ... But we've still got plenty of the second quarter earnings season to go, so possibly next week it will be a different story."
Among banks, which also staged a stellar rally on Thursday, Royal Bank of Scotland <RBS.L> was up 6.9 percent, Lloyds TSB <LLOY.L> rose 5.3 percent and HBOS <HBOS.L> added 2.8.
"These securities have been very badly beaten up," said Edward Menashy, an economist at Charles Stanley. "(But) We know one thing -- no central bank will allow a major bank to fall."
The British macroeconomic backdrop is proving a challenge for the banking sector as growth slows and inflation remains stubbornly high.
The latest batch of data on Friday showed public borrowing hit record levels in the first quarter of the financial year, threatening to breach the restrictions the government set itself on how much debt it can take on.
BOUNCING BACK
Merrill Lynch's <MER.N> larger than expected $4.89 billion quarterly loss on Thursday, along with Google <GOOG.O> and Microsoft <MSFT.O> missing Wall Street's estimates, initially weighed on global equities.
Meanwhile, mortgage giant Freddie Mac <FRE.N> is considering raising capital by selling as much as $10 billion in new shares to investors, The Wall Street Journal reported, citing people familiar with the matter.
Miners capped gains, however. Xstrata <XTA.L> shed 3.7 percent, while BHP Billiton <BLT.L> lost 2.8 percent and Rio Tinto <RIO.L> 3.2 percent.
Oil majors BP <BP.L> and Royal Dutch Shell <RDSa.L> also weighed on the index, both falling more than 1 percent as crude prices rose above $131 a barrel but traded well down from recent highs.
Shares in household and personal care product companies such as Reckitt Benckiser <RB.L>, Henkel <HNKG_p.DE> and Beiersdorf <BEIG.DE> fell after French beauty group L'Oreal <OREP.PA> cut its full-year growth outlook late on Thursday, traders said.
Reckitt Benckiser fell 5.8 percent to top the losers' list on the FTSE 100.
On the upside, GlaxoSmithKline <GSK.L> added 2.3 percent after researchers said Britain's decision to choose its Cervarix cervical cancer vaccine over Merck and Co's <MRK.N> Gardasil could save the government 20 million pounds ($40 million) annually. [
]Meanwhile, the Daily Telegraph said the International Monetary Fund had signalled that Britain was likely to avoid recession, upgrading its economic forecast for both this year and next. (Additional reporting by Dominic Lau; editing by Rory Channing)