Consumer confidence dropped two points to -20 in September, according to GfK NOP’s Consumer Confidence Index.
The fall this month comes after a rise in August, when the Index increased for the first time since February, to -18.
GfK NOP Social Research managing director Nick Moon called the August climb a “false dawn”.
He said: “September’s slump suggests the rise in consumer confidence in August was a false dawn, as feared.”
Consumers are more worried about their personal finances than last month, with the Index showing a drop of 2 points to -14.
Consumers are also feeling more negative about the general economic situation, with the Index dropping 3 points to -46, compared with last month.
The major purchase index was the only measure to increase this month, by 5 points to -15.
Moon added: “Besides the trough in July, probably caused by the emergency Budget, this month’s figure is the lowest confidence has been for the past year.
“I think we could be about to find out if the money markets are more worried about double dip recession than they are about the size of the UK deficit.”