Sir John Bourn, who headed up the National Audit Office for 20 years, has announced he is to retire early. He has recently received criticism for his lavish expenses claims, including hundreds of thousands of pounds of public money spent on restaurants and first-class foreign travel to exotic destinations, often in the company of his wife. His job has held him responsible for vetting government spending, ensuring taxpayers' money is not wasted on frivolous projects. Sir John said it had been a privilege to hold the post for 20 years and that he was stepping down for organisational reasons.