THERESA May should hold formal Brexit talks with the UK's devolved governments, the SNP's Westminster leader said at PMQs this afternoon.

Ian Blackford asked why the Prime Minister had not invited the Scottish and Welsh governments for formal discussions on the UK's departure from the European Union, but had agreed to meet with Labour leader Jeremy Corbyn.

READ MORE: Scotland locked out of talks as May and Corbyn plan Brexit stitch-up

He added: "Why is it that Scotland’s voices are being ignored by this Prime Minister and this Government?"

As Conservative MPs heckled from their benches, May responded by pointing to her recently announced meeting with the First Minister scheduled for later today – but Blackford again insisted he had been referring to "formal talks".

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He was then interupted by further heckling.

After the Speaker was able to calm the House, Blackford gave a damning response to the Prime Minister and her party.

"Thank you Mr Speaker and let me make it clear that the voices of Scotland will not be shouted down by Conservatives in this House.

"The important factor here Prime Minister is you’re having formal talks with the leader of the opposition. Scotland will not accept a Tory or a Labour Brexit. Scotland voted to remain in the European Union. And we simply will not be dragged out against our will.

READ MORE: Ian Blackford: 'Scotland's voices will not be shouted down by Tories'​

"Will the Prime Minister now engage in formal talks with the Scottish Government, with the SNP, and other opposition parties, to make sure our voices are heard, and that desire to stay in the European Union – the best deal for all of us – is listened to and respected."

May then insisted she was happy to work with members across the House to find a way to deliver Brexit, and added: "He talks about voices from Scotland, I can assure him there are indeed strong voices from Scotland in this House, they sit on the Conservative benches."

READ MORE: Brexit: Sturgeon warns against 'falling into a trap' ahead of meeting with May

Nicola Sturgeon is due to meet the Prime Minister later on today.