By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Banks lifted the U.K.'s benchmark stock index into positive territory on Wednesday, offsetting weakness for miners, as investors waited for the U.S. Federal Reserve's policy decision later in the day.

The FTSE 100 gained 0.1% to 6,577.02, after losing 0.8% on Tuesday.

The subtle move came as investors were hesitant of making any big moves ahead of the much anticipated monetary policy decision from the U.S. Federal Reserve out at 7 p.m. in London, or 2 p.m. Eastern Time.

Analysts expect the central bank to announce a reduction of $10 billion to $15 billion to its $85 billion-a-month bond-buying program after signs the economy has improved. Read: How stocks may react to the Federal Reserve decision

The Bank of England was also in the spotlight after saying the nine members of its Monetary Policy Committee earlier in September voted unanimously to keep both interest rates and the asset-purchase program unchanged. The interest rate was kept at a record low 0.5%, while the quantitative-easing program stayed at 375 billion pounds ($596.48 billion).

"A key question concerned whether there was any serious consideration of reopening the asset purchase program, given that interest-rate markets have continued to price in a still more aggressive series of rate increases since forward guidance was introduced last month," said Philip Shaw, chief economist at Investec Securities, said in a note.

"There was relatively little here. The committee did not make a comment to the extent that the shape of the yield curve was unwarranted (as it has previously)...Its conclusion was that 'were the recovery to falter, the case for further asset purchases would be stronger,'" he added.

The Bank of England in August laid out its forward guidance on interest rates, saying it will keep rates low at least until the unemployment level falls to 7%, expected in 2016. Markets, however, have looked to recent upbeat macroeconomic releases and have started factoring in a rate hike toward the end of 2014.

Among notable movers in London, banks helped push the benchmark into positive territory. Shares of Barclays PLC (BCS) picked up 0.5%, Standard Chartered PLC gained 1.9%, Lloyds Banking Group PLC rose 1.9% and heavyweight HSBC Holdings PLC (HBC) put on 1.1%.

Also on the rise, shares of Smiths Group PLC added 3.1% after the engineering company declared a special dividend for the full year.

Miners, however, declined in London as metals prices were mixed. Shares of Antofagasta PLC dropped 2.2%, Rio Tinto PLC (RIO) gave up 0.7% and Vedanta Resources PLC fell 0.4%.

Shares of Fresnillo PLC lost 2.6% to 10.14 pounds after UBS cut the price target on the silver miner to GBP11.50 from GBP12.50.

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