At least 39 bills have been subject to Royal approval, with the senior royals using their power to consent or block new laws in areas such as higher education, paternity pay and child maintenance.
Internal Whitehall papers prepared by Cabinet Office lawyers show that on one occasion the Queen vetoed the Military Actions Against Iraq Bill in 1999, which aimed to transfer the power to authorise military strikes against Iraq from the monarch to parliament.
She was also asked to consent to the Civil Partnership Act in 2004.
In the Whitehall document, which was released following a court order, the Parliamentary Counsel warns that if consent is not given by the royals "a major plank of the bill must be removed".
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