IDK. Rhetoric here suggests replacing the WA with the winning "indicative vote". Somebody still believes, UK can extort a legally binding trade agreement from the EU.

Notice contingent relation of HoC emended "Political Declaration" to the WA;

The desire to negotiate an ambitious customs deal could be swiftly written into the political declaration and formally signed off at the EU leaders' summit on 10 April.

"backstop" in either text is not addressed in this promotional piece; and this bespoke "customs union," submitted by HoC to EU, obviates bi-lateral review and approval of its terms in UK writ yet to be drafted --between now and 22 May.

Brussels would probably seek to avoid a row on this issue ahead of the withdrawal agreement and political declaration finally being ratified by the Commons.

Correctly translating "senior EU sources" to MPs special needs is untenable. 49 days.

"That new political statement can then be approved at a European summit on 10 April and then we will give the British the opportunity to formalise it in English legislation by 22 May."

Britain 'could leave [?!] EU by 22 May if MPs vote for customs union'

Diversity is the key to economic and political evolution.