UK Labour Party leadership candidate Owen Smith speaking to the BBC earlier this morning 24 Aug
if successful in his bid to lead the Opposition Smith says he will try to stop PM Theresa May formally triggering Brexit unless she promises a referendum on the final deal or calls a general election to approve it. He added that his party should not give the Tories a "blank cheque" on negotiations.
But the rival Jeremy Corbyn campaign camp said blocking Brexit would be "deeply unpopular".
Smith has told BBC Radio 5 live:
"It would be irresponsible of Theresa May to simply trigger Article 50 and sleepwalk out... Labour still believes that we should be a part of the European Union."
adding that under his leadership, Labour would oppose the triggering of Article 50 in a future Commons vote unless certain conditions were met.
"Theresa May says that 'Brexit means Brexit' - but nobody knows what Brexit looks like,"
I've been digging around and the story has been circulating for a while and may have helped underpin the pound this morning even though it still remains a highly unlikely outcome.
More from the Beeb here
Whether there is a legal requirement though to have parliament vote on Article 50 is currently the subject of a petition going to the UK's top court and a debate that's been circulating from day 1 post-Brexit vote.
The BBC has some comprehensive coverage/analysis here
Labour leadership contender Smith determined to keep the UK in EU
