Scotland is entitled to "a voice" on Brexit, the country's most senior law officer has argued at the Supreme Court.

Lord Advocate James Wolffe QC said he is not asking for a veto, but the Scottish Parliament is entitled to a vote before the triggering of Article 50 of the Lisbon Treaty to start the two-year process of negotiating the UK's withdrawal from the EU.

Whether Scotland consented is "a matter of constitutional significance".

EU law provisions would become redundant following withdrawal from the EU with a whole series of effects on Scotland's devolved legislative powers, said Mr Wolffe in submissions to 11 justices in the highest court in the land.

He argued that giving notice under Article 50 would require an Act of Parliament at Westminster and a legislative consent motion from Holyrood.

He submitted that the devolved governments of Scotland, Northern Ireland and Wales are encouraged by "constitutional convention" to "have a voice in the decision".

The Lord Advocate will continue his submissions on Thursday, the last day of the Supreme Court hearing.