By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks moved cautiously higher on Wednesday, as investors weighed the revamped forward-guidance framework from the Bank of England and speculated when the first rate hike would come.

The FTSE 100 index closed slightly higher at 6,675.03, after trading as high as 6,708.17 earlier in the day.

The day's main event was the Bank of England's quarterly inflation report. The central bank revamped its forward guidance, leaving traders and economists confused about when to expect the first interest-rate hike.

Gov. Mark Carney indicated rates could rise in the second quarter of 2015 rather than 2016 as previously forecast, but several analysts argued an increase could come before that. Nomura forecast the first rate hike to come this August, while Rob Wood, chief U.K. economist at Berenberg said the first quarter of 2015 was more likely.

"Carney's approach today was the right response to the developments in the economy, with slack materially eroding and prospects for growth improving. The first rate hike will need to come sooner than they previously thought, so they have backed away from dovish guidance," Wood said in emailed comments.

"Though, in our view, unemployment will fall faster than the Bank is expecting so the first rate hike will come sooner [than the BOE forecasts]," he added.

The central bank noted that the U.K.'s unemployment rate has fallen much faster than expected, and said its 7% threshold is likely to be reached by spring.

Carney said, however, that rates will stay low well after that point and the bank instead will consider a broad range of indicators, including the unemployment rate, business surveys and the number of hours worked.

The bank also lifted its expectations for economic growth in 2014 to 3.4%, from a previous estimate of 2.8%.

The pound rose after the inflation report, trading at $1.6578, up from $1.6450 late Tuesday.

Among individual stocks, Wm. Morrison Supermarkets PLC rose 0.3%, after Bloomberg reported that the supermarket chain has contacted private-equity funds to potentially take the company private. A representative from Morrisons wasn't immediately available to comment.

Mining firms gained, tracking metals prices higher. The sector was boosted by upbeat trade data from China, which showed imports increased 10% in January. This indicated a pickup from December and beat analyst expectations. China is a major user of natural resources, so any signs of a rise in demand in the country tend to help metals prices and miners.

Shares of Anglo American PLC gained 1%, Glencore Xstrata PLC (GLCNF) rose 1.3%, and Rio Tinto PLC (RIO) added 1.5%.

But Tullow Oil PLC slumped 6.3% after the oil and gas explorer said it is considering selling part of its stake in a Ugandan oil field.

More must-reads from MarketWatch:

Forward Guidance 2.0: Is Carney just digging with a larger shovel?

ECB 'seriously' considering negative deposit rate

Sold on gold: Miners signal a chance to go long

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