EDINBURGH, Sept. 10 -- The Better Together campaign on Wednesday night had a six-point lead over the "Yes" campaign for Scotland's independence, latest poll result showed.

If undecided voters were excluded, the "No" side would win with 53 percent of the vote against 47 percent for "Yes," according to a survey conducted by the market research company Survation exclusively for the Scottish newspaper Daily Record.

In the survey conducted between Friday evening and Tuesday morning, 47.6 percent of 1,000 queried said they intended to vote "No" in the Sept. 18 referendum, 42.4 percent preferred "Yes" and 10 percent said they were undecided.

The result came three days after the YouGov Plc's survey for the Sunday Times for the first time put the "Yes" voters ahead of the "No" voters by 51 percent to 49 percent.

The referendum result still remains on a knife-edge just seven days ahead of the voting.

Earlier Wednesday, British Petroleum Group Chief Executive Bob Dudley and Scottish oil tycoon Sir Ian Wood came forward to oppose Scotland's independence.

In October 2012, British Prime Minister David Cameron and Scottish First Minister Alex Salmond signed the Edinburgh Agreement, allowing Scotland to hold an independence referendum in autumn 2014 on "Should Scotland be an independent country?"