Queen Elizabeth II was a Remainer opposed to Britain’s decision to leave the European Union, a new book has sensationally claimed.

In one of the few major insights into the late monarch’s political leanings, it is alleged the Queen told a senior minister three months before the 2016 Brexit referendum: ‘We shouldn’t leave the EU.’

She is later said to have added: ‘It’s better to stick with the devil you know.’

The bombshell revelation emerged in an upcoming book by veteran former royal correspondent Valentine Low, entitled ‘Power and the Palace: The Inside Story of the Monarchy and 10 Downing Street.’

In an extract serialised in The Times this evening, one Buckingham Palace insider said that, while the Queen could be frustrated by Brussels bureaucracy, she saw the EU as part of the postwar settlement, ‘marking an era of cooperation after two world wars.’