* Oils hold firm; crude slips back on Opec news
* Heavyweight banks, pharmas and Vodafone in demand
* UK Q3 GDP revised up less than expected
By Jon Hopkins
LONDON, Dec 22 (Reuters) - Britain's leading share index was 1.0 percent higher around midday on Tuesday as a broad-based pre-Christmas rally led by energy issues took hold following the release of slightly disappointing GDP numbers.
At 1156 GMT, the FTSE 100 index <
> was up 54.36 points at 5,348.35, having closed 1.9 percent higher on Monday its biggest one-day percentage gain since Dec. 1."Finally there are signs that Santa has turned up for the obligatory Christmas rally, although perhaps a little bit less generous than seen in previous years," said Henk Potts, market strategist at Barclays Wealth.
Investors shrugged aside a slightly disappointing final reading for British third-quarter GDP, with the quarterly contraction only revised back to -0.2 percent, from the -0.3 percent seen at the first revision, and the year-on-year figure unchanged at -5.1 percent. [
]"Third-quarter GDP was not revised up as much as expected, with the UK economy still in recession ... (and) although growth is expected to return in the fourth-quarter the outlook is still very poor indeed," Potts said.
Energy issues were the top blue chips performers although crude prices <CLc1> slipped back below $74 a barrel after OPEC, as expected, agreed to roll over its production targets following a meeting in Luanda. [
]Royal Dutch Shell <RDSa.L>, BG Group <BG.L>, BP <BP.L> and Tullow Oil <TLW.L> added 0.6 to 2.7 percent.
Cairn Energy <CNE.L> was the top FTSE 100 riser, up 4.7 percent after the company's 10-for-1 share split took effect.
Cairn's shares closed at their highest level since June 2008 on Monday after the explorer said it had secured a rig to allow it to commence a drilling programme offshore western Greenland.
Defensive issues, traditionally laggards in a bull market, were also higher as the pre-Christmas rally took hold.
Pharmaceutical firms AstraZeneca <AZN.L> and GlaxoSmithKline <GSK.L> rose 1.7 percent and 2.5 percent respectively, while tobacco giants British American Tobacco <BATS.L> and Imperial Tobacco <IMT.L> gained 0.8 and 1.9 percent.
Mobile telecoms heavyweight Vodafone <VOD.L> added 1.1 percent following an upbeat interview with the firm's head of UK business, Guy Laurence in the Financial Times. [
]Banks were higher across the board as HSBC <HSBA.L> recovered from earlier falls, taking on 0.8 percent, with Barclays <BARC.L>, Lloyds Banking Group <LLOY.L> and Standard Chartered <STAN.L> adding between 0.2 and 1.3 percent.
MINERS MIXED
Miners were mixed, although higher overall as the gold price <XAU=> rose benefitting from a weaker dollar. Kazakhmys <KAZ.L>, Eurasian Natural Resources <ENRC.L>, BHP Billiton <BLT.L> and Rio Tinto <RIO.L> added 0.1 to 0.5 percent.
But Xstrata <XTA.L>, Vedanta Resources <VED.L> and Fresnillo <FRES.L> missed out, falling 0.6 to 0.9 percent.
British Airways <BAY.L> was the top FTSE 100 faller, down 1.2 percent as the winter storms in Europe continued to cause travel chaos, and following a U.S. ruling on the airline's planned link-up with American Airlines <AMR.N>.
American Airlines and British Airways should agree to concessions to secure approval of a bid to deepen their transatlantic alliance, the U.S. Justice Department said on Monday. [
]Travel group Thomas Cook <TCG.L> was also hit by concerns over the travel problems experienced in the UK and Europe after the heavier than usual snowfalls, shedding 0.8 percent.
On the second-line, housebuilders were good performers, led by Barratt Developments <BDEV.L> and Taylor Wimpey <TW.L>, which were gained 2.0 and 3.6 percent respectively, after Goldman Sachs upped both stocks on valuation grounds in a sector review.
U.S. stock futures <SPc1>, <DJc1>, <NDc1> pointed to early gains on Wall Street on Tuesday, extending Monday's advance, although some key U.S. data will need to be digested.
The final reading for U.S. third-quarter GDP will be unveiled at 13.30 GMT this afternoon, followed by November U.S. existing home sales data at 1500 GMT. (Editing by Mike Nesbit)