Officials with the prime minister's staff said Cameron's daughter, Nancy, was left alone at The Plough in Cadsden for about 15 minutes after the family had lunch, The Sun reported Monday.
"The PM and [his wife] Samantha were distraught when they realized Nancy wasn't with them," Cameron's office said in a statement. "Thankfully when they phoned the pub, she was there safe and well. The PM went down straight away to get her."
The Camerons and their three children were having lunch Sunday with two other couples. When they were leaving, Cameron thought Nancy was in a second vehicle with his wife and other children and his wife thought the girl was with her father, The Sun said.
"You'd have thought someone would have done a headcount or something," a Plough source told The Sun. "Pub staff found their daughter in the toilet and didn't know what to do. It's not like you can look up David Cameron in the phone book and then ring to say, 'You've left your daughter behind.'"