Jeremy Corbyn has said a referendum on the unification of the island of Ireland should not be blocked if Stormont wants one.

The Labour leader said Brexit throws up an 'enormous complication' about how to deal with the border between Northern Ireland and the Republic.

And when asked about the movement of people and goods between the north and the south, he said it was up to the people of Northern Ireland to decide.

Jeremy Corbyn interviewed on Britain and the EU: The Brexit InterviewsBrexit - What Next? The Andrew Neil Interviews

Andrew Neil interviews Labour leader Jeremy Corbyn and other party leaders on Brexit

Jeremy Corbyn said a Northern Ireland referendum should not be blocked if the assembly calls for one

In an interview with the BBC's Andrew Neil, he was pressed on whether or not voters should be allowed a referendum on uniting Northern Ireland and the Republic.

He said: 'That's up to the people of Northern Ireland to decide. If the Northern Ireland Assembly wants to have one then they should be allowed to.'

Mr Corbyn insisted he was 'not in favour' of a second Scottish referendum but Westminster should not block requests from the Scottish Parliament.

'I don't think Westminster should block it but I think there should be a serious discussion about the timing of it because if they referendum occurs during the Brexit negotiations it becomes a bit complicated.

'I would say that it shouldn't take place, if it takes place, until after the Brexit negotiations have been completed.'

Andrew Neil interviewed Jeremy Corbyn as well as the Prime Minister Theresa May on TV

'If the Northern Ireland Assembly wants to have one then they should be allowed to,' said Mr Corbyn

Mr Corbyn backed the PM's decision not to push for continued membership of the single market.

He said: 'I don't think we can be members of the single market if we are not members of the European Union. This issue is one of access.'

Mr Corbyn said Labour would vote against the final deal in Parliament if it fails to meet the six tests set out earlier this week by his party, which includes demands for the 'exact same benefits' as the UK currently has as a member of the single market and customs union?

'We would vote against it,' he said.

But he denied the move would lead to the UK crashing out of the EU, insisting an agreement could be reached with the other 27 members.

Pressed on what would happen if they refused, he replied: 'You would have to argue very strongly with them.'