Earlier, Theresa May was forced to again insist the United Kingdom must leave the customs union after Brexit in order to strike trade deals around the world after a massive defeat on the issue in the Lords previously.
Though a transition period with the EU has been agreed, and continuing membership of the customs union appears to have been ruled out by 10 Downing Street, MPs - and, more importantly, businesses - deserve clarity on the Government's intentions. Staying in the customs union would mean Britain effectively outsources its trade policy on goods, though it could still go its own way on services.
"But of course any change from the United Kingdom must respect our principles, the principles we have built with the United Kingdom over 45 years". The flipside is that in the trade-off of Brexit talks, the United Kingdom would still be able to keep its pledge to end freedom of movement, which wouldn't be possible if it stayed in the single market. They are all indivisible.
'You can not have free movement of services without free movement of goods, and so forth.
And Mrs May insisted yesterday that she is still working towards implementing the proposals that were reportedly rejected by the European Union last week. According to the bloc, the only possible framework for future cooperation between Britain and the European Union is a trade deal.
The biggest outstanding issue is how to avoid a hard border in Ireland if the United Kingdom leaves the single market and customs union, as the United Kingdom government now intends.
"We've put forward proposals that will deliver a frictionless border and enable us to do trade deals around the rest of the world", May told reporters.
Mrs May proposed that the UK collect EU import tariffs on behalf of Brussels during her Mansion House speech on future EU-UK relations last month.
But Mrs May is set to face calls from leading Brexiteers Boris Johnson, David Davis and Liam Fox to abandon her preferred form of customs deal, according to The Times.
Reports last week suggested that the European Union had dismissed as unworkable both of the options put forward by Westminster, which would either see the United Kingdom collect customs tariffs on behalf of the European Union or use technology to avoid delays at the border between Ireland and the UK.
Though the looming Commons vote on a pro-customs union motion would be a symbolic, non-binding one, it has the potential to deepen Tory wounds on Brexit.