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The UK government has refused to confirm that Wales' National Assembly will get to have its say on a key Brexit vote - even after saying the Scottish Parliament would.

The Great Repeal Bill - expected later in 2017 - will end the EU’s legal supremacy in the UK and transfer the bulk of EU rules and regulations into British law.

This change will have profound impact on the Welsh Government and Assembly - who are currently responsible for many of the policy areas that will be affected.

Last week it was revealed that the UK Government will seek the consent of the Scottish Parliament over the legislation that will bring EU laws back to the UK - it did not give the same guarantees to Wales.

Plaid Cymru’s spokesperson on the constitution Liz Saville Roberts said that if the Senedd was not given the same opportunity as the Scottish Parliament the relationship between Westminster and Wales would be “in pieces”.

She said: “There is a long-standing convention between Westminster and Wales that the UK will not pass laws on Welsh matters without the consent of the National Assembly.

“If the UK Government decides to ignore this convention and starts dictating from Westminster against the will of the people of Wales, the so-called ‘partnership of equals’ will be in pieces.

“That the Wales Office gives such a weak response while David Mundell gives an unequivocal statement that the Scottish Parliament will be respected, illustrates the weakness of our devolution settlement and the Secretary of State himself.”

The Scottish Secretary David Mundell said he was working on the basis that MSPs in Edinburgh would vote in a legislative consent motion on the Great Repeal Bill.

Last week the Supreme Court ruled that the UK government would not have to seek the consent of devolved assemblies before the UK government triggers Article 50 - the process that will kick start Brexit.

A legislative consent motion (LCM) is the process where the UK government asks the Welsh Assembly if it can legislate on issues normally decided in the Senedd.

The Welsh Government spokesman suggested it thought it was likely that the Great Repeal Bill would require a LCM but was waiting for the bill to be published before coming to a definitive view.

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Mr Mundell continued: “It is difficult to envisage a situation where a Bill of such constitutional significance would not have an impact on matters that are devolved to Wales.

(Image: Stefan Rousseau/PA Wire)

“That’s why we are determined to safeguard the devolution settlement and ensure powers already devolved to Wales are not taken back by Westminster as part of the Brexit process.

“A decision as to whether an LCM is required will depend on the specific terms in which the Repeal Bill is framed. We will be better placed to reach a decision on this once further details about the Bill emerge.”

Speaking after a conversation with Scottish Ministers in Edinburgh Mr Mundell said that if the Scottish Parliament had been excluded that it would have had “very serious consequences”.

He said: “I anticipate that unlike the Article 50 notification that the Great Repeal Bill would be the subject of the legislative consent process and I am working on that basis.

A UK Government spokesman however did not confirm that a legislative consent motion would be sought in the Welsh Assembly, telling Wales Online to wait and see.

A UK Government spokesperson said: “We will continue to engage with the Devolved Administrations ahead of the Bill, to get the maximum possible national consensus on how we go about this.

“There is an established process for parliamentary legislation in the form of the Sewel Convention. The Bill has not yet been published and its content will determine the process to take it forward.”