* FTSE 100 down 0.8 percent ahead U.S. GDP figures
* Miners wane on U.S. concerns and China growth
* Inmarsat higher on LightSquared deal
By David Brett
LONDON, Jan 28 (Reuters) - UK economic pressures and caution ahead of U.S. GDP figures forced investors on to the sidelines as Britain's top shares fell on Friday, with miners the top fallers hit along with weak metal prices.
By 1211 GMT the FTSE 100 <
> was down 48.21 points, or 0.8 percent, at 5,916.87 after it edged 0.1 percent lower on Thursday.BHP Billiton <BLT.L> fell 2 percent, dragged lower as jitters about prospects for the economic outlook ahead of U.S. growth data depressed metal prices.
Investors focus will turn to the U.S. this afternoon when the world's biggest economy will announce its latest GDP figures, due at 1330 GMT, with some fearing expectations are too optimistic.
"Some traders feel (the growth expectation) is a little over optimistic given (that) the lingering unemployment rate and depressed housing market are still major issues for the U.S. economy," Jonathan Sudaria, a dealer at Capital Spreads, said.
The economy grew at a solid 3.5 percent annual rate in the final three months of 2010, according to a Reuters survey, after expanding at a 2.6 percent pace in the third quarter. [
]London's blue chip index began the year in a bullish mood putting on more than 3 percent as traders returned from the Christmas and New Year break.
However, gains have been pared as macroeconomic pressures have prompted uncertainty among investors and brought the index back to almost flat on the year.
"There's an element of caution in the UK market with concerns particularly around China," David Jones, chief market strategist at IG Index, said.
"China might be looking to keep a cap on growth and inflation under control, and because there are so many mining stocks in the FTSE, whenever we have those worries that knocks the index."
RETAILERS WOE
UK retailers were under pressure after data showed British consumer confidence tumbled to its lowest in almost two years in January. [
]Marks & Spencer <MKS.L> fell 1.2 percent while home improvements chain Kingfisher <KGF.L> lost 1.5 percent, and as the sector continued to feel the knock on effect from European peer Hennes & Mauritz's <HMb.ST> downbeat results on Thursday.
Tui Travel <TT.L>, which reported its first-quarter update in the previous session, feel 3.3 percent as Natixis cut the stock to "neutral" from "buy".
On the upside, Inmarsat <ISA.L> rose 3.4 percent after confirming the second phase of the cooperation agreement with U.S. firm LightSquared, which brokers said could see upside to market expectations for the value of Inmarsat's U.S. spectrum.
Technical analysts said charts point to a bearish outlook for the blue-chip index.
"Wednesday's rally stopped at 6,003.28 and the market closed below the lower end of the retracement zone at 5,965.88 on Thursday," said James Hyerczyk, analyst at Autochartist.
"The weak close may be indicating that traders are reluctant to chase this market higher and could be waiting for a substantial break to drive this index into a more attractive value area." (Editing by Hans Peters)