SKB, re your reference to American Revolution as unique. Some five centuries earlier, before there was an European foot on this continent, there was the Magna Carta:

"Magna Carta, which means 'The Great Charter', is one of the most important documents in history as it established the principle that everyone is subject to the law, even the king, and guarantees the rights of individuals, the right to justice and the right to a fair trial."

The English barons didn't need a revolution in 1215. They put their bill before the king and said sign it. The British colonists who threw off their motherland's yoke became Americans. As for constitutions and bills of rights, the UK does not have a written constitution. All laws change with the times anyway.