Support for Scottish independence has fallen following a TV debate last week and the campaign to split the United Kingdom will need a dramatic turnaround if it is to win a forthcoming referendum, a poll showed on Saturday.

The Survation poll for the Scottish Daily Mail newspaper said 50 percent of respondents planned to vote against independence in a ballot due on Sept. 18 that will decide whether Scotland breaks its 307-year union with England.

It was the highest level of support for remaining part of the United Kingdom in all Survation polls since February.