By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks ended a choppy day close to the flat line on Wednesday as concern remained among investors that Scotland will vote for its independence at a referendum next week.

The FTSE 100 index closed marginally higher at 6,830.11, after three days mired in the red.

Scotland jitters: The London benchmark has been hit by fears that Scots will vote to leave the United Kingdom at the independence referendum on Sept. 18. A poll over the weekend showed the pro-independence camp was in the lead for the first time, awakening the world to the scenario that Scotland could leave the union. In other recent polls, the outcome has been too close to tell.

Several British parliament members have called on the Queen to intervene to help keep the U.K. together, but the monarch in the Times on Wednesday warned politicians not to drag her into the battle.

The pound (GBPUSD) took a beating earlier in the week on the Scottish fears, but recovered slightly on Wednesday to trade at $1.6133, up from $1.6116 late Tuesday in New York.

Movers: Sports Direct International PLC lost 1.7% after the retailer said sales in the first quarter were impacted by England's "disappointing" World Cup performance.

Barratt Developments PLC climbed 2.8% after the house builder said full-year pretax profit more than tripled.

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