British PM David Cameron urges Scots not to break up nation
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The referendum is due in 2014 but a date has not yet been set.
A poll reported last month in the Scotsman newspaper found that only 23 percent of people in Scotland support independence, down nine points on the previous year, with 61 percent backing continued devolution in the UK.
The vote has also raised the question of Scotland's status within the current 27-member EU if it decides to split.