* FTSE hits fresh 12-month highs
* Banks, commodity stocks in demand as risk appetite returns
* Broker upgrades lift airlines
By Tricia Wright
LONDON, Sept 17 (Reuters) - Banks and commodity stocks helped lift the FTSE 100 <
> 0.7 percent by midday on Thursday, taking its rally into a fifth straight session on global economic recovery hopes.At 1122 GMT the FTSE 100 was up 36.86 points at 5,160.99, having added 1.6 percent on Wednesday to end the session at 5,124.13 -- the highest close since late September last year.
"Obviously markets can't continue to go up in a completely straight line -- one would expect a correction at some point, said Richard Hunter, head of UK equities at Hargreaves Lansdown.
"But for the moment, whilst the big question mark remains about how sustainable or strong any economic recovery might be, the market's very much in an optimistic mood," he said.
The FTSE 100 has gained 21.5 percent this quarter and is on track to post its best percentage quarterly gains since the index was launched in 1984, but it is still down 4.6 percent from a year ago, just before the collapse of Lehman Brothers.
Banks added the most points to the blue-chip index, extending Wednesday's gains as growing investor confidence in a global economic recovery bolstered their appetite for risk.
Heavyweight HSBC <HSBA.L> added 1.3 percent, while Barclays <BARC.L>, Lloyds Banking Group <LLOY.L>, Royal Bank of Scotland <RBS.L> and Standard Chartered <STAN.L> rose 0.5-1.4 percent.
Energy stocks were in demand as crude prices <CLc1> held steady above $72 a barrel, taking a breather after a rise of more than 2 percent a day earlier, with BP <BP.L> and Royal Dutch Shell <RDSa.L> adding 1.1 and 0.9 percent, respectively.
Tullow Oil <TLW.L> climbed 4.5 percent after the oil explorer says it has struck what may turn out to be the largest oil find in Uganda, prompting brokers to upgrade ratings and target prices for the company. [
]Against a backdrop of broadly firmer metals prices, miners also rose, with gold prices hitting 18-month highs for a second consecutive session <XAU=>.
Randgold Resources <RRS.L>, Fresnillo <FRES.L>, Rio Tinto <RIO.L> and BHP Billiton <BLT.L> gained 1.3-3.8 percent.
Broker upgrades also lent support, with Antofagasta <ANTO.L> up 3 percent as Cazenove upped its rating on the stock to "outperform" and Anglo American <AAL.L> adding 1.3 percent as Barclays Capital hiked its rating on the firm to "overweight".
Eurasian Natural Resources <ENRC.L> bucked the sector trend, shedding 0.5 percent after the Kazakh mining group confirmed late on Wednesday that it was mulling over a cash bid for CAMEC <CFM.L>. [
]
AIRLINES CLIMB
British Airways <BAY.L> topped the blue-chip leaderboard, up 5.8 percent as Goldman Sachs added the stock to its pan-European "conviction buy list" and raised the airline's price target. [
]BA is interested in UK rival bmi and has spoken with bmi's German owner Lufthansa <LHAG.DE>, the UK flag carrier's chief executive Willie Walsh told the Evening Standard. [
]Discount airline easyJet <EZJ.L>, meanwhile, was the biggest FTSE 250 <
> riser, up 6.1 percent after a Morgan Stanley upgrade to "overweight" from "equal-weight".Kingfisher <KGF.L>, Europe's biggest home improvements retailer, added 1.7 percent after posting a 35 percent rise in first-half profit, joining a growing list of store groups to defy analysts' fears while also warning of a slow recovery. [
]British retail sales were flat on the month in August against expectations for a small rise, with clothing sales exerting the biggest downward impact, official data showed on Thursday. [
]Balfour Beatty <BALF.L> gained 1.7 percent after the construction company confirmed it was in advanced talks regarding a "significant" acquisition and was mulling over a rights issue to fund a deal.
Later today, investor attention will be drawn across the Atlantic to U.S. housing starts and weekly jobless claims.
(Editing by David Cowell)