The Prime Minister has told ITV News Anglia he will have his work cut out to win back voters who backed UKIP at the local elections.
David Cameron also said he would consider carefully plans to toll the A14 after one of his MPs started a petition against it.
ITV News Anglia's political correspondent Emma Hutchinson spoke to the Prime Minister as the Conservative Party conference got underway in Manchester.
Click below to watch a report from ITV News Anglia's Emma Hutchinson
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Douglas Carswell told ITV's Peston On Sunday he wanted to "support" the government as a "critical friend" but refused to rule out a return.
The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".
Another fine sunny day.