Sixty-one per cent of people in Great Britain agree that information on their finances, including presently opaque aspects like the Duchy of Cornwall, should be publicly accessible and clearly presented.

The poll was commissioned by the society to mark the forthcoming coronation of Charles III. It showed that a majority, 54 per cent, favour keeping the monarchy, while 20 per cent want to create a republic.

But, if the monarchy is retained, there was significantly more support for reforming the institution than for it staying the way it is, by 45 per cent to 27 per cent. A plurality of respondents, 28 per cent versus 22 per cent, also supported the requirement that the monarch be a member of the Church of England.

Professor Andrew Blick of King’s College London, senior adviser to the Constitution Society, said: “The monarchy is a deeply embedded part of our public life and constitutional system. This poll confirms that a majority support its continued existence. But this figure is in the low 50s; and there is clear evidence of dislike for the wider royal family receiving financial support; and of support for royal finances being transparent.”