There's a thinking that if any of the proposals MPs put forward gain majorities, the ones that call for the softest of Brexits stand the best chance.

Two different motions put forward by Conservative MPs - Nick Boles and Ken Clarke - would each see the UK remain in a customs union with the EU.

So what would that mean for a post-Brexit Britain?

Here is Sky's business correspondent Adam Parsons to explain.

SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews

Follow us on Twitter: https://twitter.com/skynews and https://twitter.com/skynewsbreak

Like us on Facebook: https://www.facebook.com/skynews

Follow us on Instagram: https://www.instagram.com/skynews

For more content go to http://news.sky.com and download our apps:

Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8

Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB