By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks moved cautiously higher on Wednesday, as investors waited for the Bank of England's quarterly inflation report, where the central bank is widely expected to revamp its forward-guidance framework.

The FTSE 100 index gained 0.2% to 6,688.16, setting it on track for a sixth straight day of gains.

The main event for investors in London was the upcoming inflation report, with investors are waiting to see whether Governor Mark Carney will makeover the interest-rate strategy he introduced in August. With the unemployment rate dropping faster than expected, pressure has been mounting on the BOE to explain to markets what will happen when the U.K.'s joblessness level drops to the central bank's 7% threshold.

Carney has stressed there is no immediate need for a rate hike, so any comments on an update to forward guidance will be closely watched. The inflation report is out at 10:30 a.m. London time, or 5:30 a.m. Eastern Time.

In the corporate space, Wm. Morrison Supermarkets PLC posted the biggest gain in the FTSE 100, up 2.2%, 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 were also on the rise, 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 2.2%, Glencore Xstrata PLC (GLCNF) rose 1.2%, and Rio Tinto PLC (RIO) added 1.1%.

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