* FTSE 100 up 0.9 percent, close to technical levels
* Energy stocks up as crude surpasses $80 per barrel
* Chinese, U.S. data supportive, weak UK data shrugged off
By Simon Falush
LONDON, Oct 1 (Reuters) - Firmer energy stocks fuelled gains in Britain's top shares, as growing optimism on the economy pushed crude prices higher while BG Group <BG.L> rose sharply as Spanish peer Repsol announced a deal with Chinese group Sinopec.
By 1050 GMT the FTSE 100 <
> was up 47.92 points, or 0.9 percent, at 5,5596.54 points after it closed down 0.4 percent on Thursday. The index ended September 6.2 percent higher.The index was close to a high set in mid April, but technical resistance levels were keeping it in check, analysts said.
"Around 5,610 is a 78.6 percent retracement of the April high and July low," said Phil Roberts Phil Roberts, chief European technical strategist at Barclays Capital.
"The fact that we have spent around three weeks below it shows it is important, the longer we stay here the more it is being eroded," he said.
He added that the index would need to move to around 5,700 before he could be confident that an uptrend is in place.
Crude <CLc1> rose beyond $80 per barrel and metal prices firmed across the board as stronger-than expected economic data from China and the United States boosted confidence in the global economic recovery.
This lifted miners and energy stocks with Xstrata <XTA.L> adding 1.1 percent and BP <BP.L> up 3.7 percent.
But BG Group was the star UK blue-chip performer, up 4.7 percent as an agreement between Chinese refiner Sinopec Group <0836.HK> and Repsol <REP.MC> was seen as supportive to the UK company's valuation. [
]BP <BP.L> gained 3.5 percent. The stock, which has surged around 9 percent in three sessions, is running into strong technical resistance around 446 pence.
Chinese manufacturing gathered momentum last month, easily beating forecasts and providing further evidence that the economy is pulling smoothly out of a second-quarter slowdown.
UPSIDE LIMITED
However analysts saw limited upside for equities ahead of more concrete corporate news.
"I think we'll be range-bound until earnings season in two or three weeks time," said Josh Raymond at City Index.
"From there we may get a kick higher considering that the last two earnings seasons have been pretty good.
Equity investors shrugged off economic data that showed activity in Britain's manufacturing sector weakened more than expected in September to grow at its slowest pace in 10 months. [
]UK banks got a lift on the slightly improved appetite for risk, with Barclays <BARC.L> gaining 1 percent while HSBC <HSBA.L> added 1.3 percent.
Engineers Weir Group <WEIR.L> and Invensys <ISYS.L> were among the top gainers, up 2.9 and 2 percent respectively, with traders saying there was read-across from Cookson <CKSN.L> which gained on Thursday on vague bid talk.
Across the Atlantic, the final reading of the Reuters/University of Michigan consumer sentiment index for September will be released at 1355 GMT. The U.S. Institute for Supply Management will release its September manufacturing index at 1400 GMT. (Additional reporting by Blaise Robinson and Tricia Wright; Editing by Sharon Lindores)