'Ministers have been forced to seek permission from Prince Charles to pass at least a dozen government bills, according to a Guardian investigation into a secretive constitutional loophole that gives him the right to veto legislation that might affect his private interests.

Since 2005, ministers from six departments have sought the Prince of Wales' consent to draft bills on everything from road safety to gambling and the London Olympics, in an arrangement described by constitutional lawyers as a royal "nuclear deterrent" over public policy. Unlike royal assent to bills, which is exercised by the Queen as a matter of constitutional law, the prince's power applies when a new bill might affect his own interests, in particular the Duchy of Cornwall, a private £700m property empire that last year provided him with an £18m income.'

Read more: Prince Charles Has Been Offered a Veto Over 12 Government Bills Since 2005