The Commonwealth of Britain Bill reference article from the English Wikipedia on 24-Apr-2004
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Commonwealth of Britain Bill

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The Commonwealth of Britain Bill was introduced by Tony Benn, who was then a Labour MP in the House of Commons, first in 1991.

It proposed abolishing the British monarchy, with the United Kingdom of Great Britain and Northern Ireland becoming a 'democratic, federal and secular commonwealth', in effect, a republic with a written constitution. Under the bill

It has been read in Parliament a number of times since, and has never achieved a second reading.