British Prime Minister David Cameron thought about resigning if Scotland voted to leave the United Kingdom, he said in an interview out Sunday.

Cameron told The Sun newspaper he "absolutely" considered quitting but in the end decided it would have been the wrong thing to do.

Scottish residents voted by 55 percent to 45 percent on September 18 to remain in the UK rather than becoming a separate state.

"I thought about resigning because I care so passionately about this issue," Cameron said.

"If the vote had been for Scotland to have left the UK, I genuinely would have been heartbroken. I would have felt winded and wounded.

"Emotionally, one would have thought, 'I'm so saddened by this. I find it difficult to go on'."

Cameron leads the Conservative and Unionist Party and campaigned for Scotland to stick with the 307-year-old union with England.

"Of course I contemplated having to go," the prime minister said.

"In the end I came to the conclusion that it would not have been the right thing to do.

"You would leave your country at a time of its need with a vacuum at the top.

"I did absolutely think about it and emotionally there was a pull. But fortunately this didn't happen."