Wales voted overwhelmingly to change the assembly's legislative system in a referendum on assembly powers on 3 March 2011.

BBC: Statement on the referendum

Johnson said the project in one form or another has been subject to 15 votes from various legislative bodies, so no referendum is necessary.

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Counsel General John Griffiths AM also answered a question on the assembly government's legislative plans following the result of the referendum on full law-making powers.

BBC: Local government questions