official document

They interviewed dozens of centenarians and checked official documents, making a mark on a map with a blue pen every time they confirmed someone’s age.

A BBC Radio 4 You and Yours investigation found that Richard Russell was named on official documents as the boss of the online ticketing site without him knowing anything about it.

She was later appointed home secretary, but had to resign when it emerged she had sent an official document to a parliamentary colleague using her personal email.

Dr McCormack said: "I told Mr Harvey that's not the case, it's definitely not the case. I said: 'You know, this isn't right that this is down in an official document."

More specific rules on government communication say official documents should "seek to explain the decisions of the government of the day in a balanced and objective way", without attacking critics.