Even being a former president of the United States isn't enough to guarantee a table at Jamie Oliver's landmark London restaurant Fifteen, it appears. Bill Clinton was turned away from the television chef's restaurant because it was full and staff refused to bump other patrons with a booking, it was reported. Fifteen, which is staffed by rookie chefs recruited and trained by Oliver in the television program Jamie's Kitchen, is so popular diners have to book three months in advance. The former US president wanted to visit the restaurant during a recent visit to London and a staff member rang...