The Prime Minister says the entire UK would be worse off if Scotland was to break from the union.
David Cameron was speaking to ITV Border on the second day of the Conservative party conference in Birmingham.
Mr Cameron said he would put party political differences aside to campaign against Scottish independence.
Helen Ford began her interview on the subject of cuts, after the Chancellor announced his intention to save an extra £10 billion from the welfare bill.
She asked the PM if he could understand why some in the North East of England believe they are being unfairly penalised.
Watch Helen's full interview.
More top news
ITV Border can reveal a big increase in the number of dogs stolen in the county in 2014. Alison Taylor's dog, Lizzie, was taken as a puppy.
The number of passes was up more than five percent on the previous year. But critics question the fairness of the new system.
The family of Christian Pay, who died on Friday after suspected substance abuse at a festival, have paid tribute to the Millom teenager.