SCOTTISH Secretary David Mundell has been accused of failing to understand the Brexit process by SNP minister Mike Russell.

Russell, the SNP's Brexit minister, said Mundell has wrongly claimed "work is progressing well", when talking about meetings between the Scottish and UK Governments on the formal process for leaving the EU.

The SNP minister, in a letter to Holyrood's Europe committee, claimed the "UK Government's position on immigration and the customs union remains very unclear".

Russell added: "It appears he (Mundell) has not been properly briefed or does not fully understand the process."

A Scottish Government source added: “David Mundell is guilty of grossly over-claiming on the nature of the discussions which have been had. His aim seems to be to make out that there are wide areas of agreement between us on Brexit – there simply aren’t."

However, a UK Government spokesperson, in response, said: The Secretary of State for Scotland set out the extensive joint work that is taking place between the UK and Scottish governments" in a briefing to MSPs.

The UK Government spokesperson added: "The people of Scotland expect their two governments to work collaboratively and constructively on vital and complex issues as we prepare to leave the EU."