That's the ninth Labour lawmaker to quit the party and brings the total between Tory and Labour this week to a dozen
Much like the others, Austin's resignation isn't going to have a significant impact on the Brexit vote - if we do get there - but it continues to intensify the focus of how fragmented the UK parliament is when it comes to handling Brexit.
Once again, just be wary of how the resignations here could potentially lead to an upheaval in British politics. But until we get there, this is merely a trivial issue.
