Prime minister David Cameron forgot to take home back his eight-year-old daughter Nancy from the 16th-century pub Plough Inn near the PM’s country home Chequers, where the Camerons – PM, wife Samantha, children Nancy, Arthur and Florence – went to have their Sunday lunch with two other families. After getting home from the pub, the Camerons were terrified to find Nancy was missing. “The Prime Minister and Samantha were distraught…