The more appropriate question would be to EU members who need to vote whether they should “cash an unsigned check” knowing that it was written under duress. If the entity forcing the letter to be drafted —. IF all 322 members of the UK parliament signed the “check” would the EU be authorized to cash it since none of those 322 MP’s are ok the “account” ?
1. it’s not “EU members” - it’s the executive of the confederation namely the 27 elected heads of government of the 27 countries
2. they don’t “need to” do anything - there are 10 days. The letter will go back to the UK with “err.. you forgot to sign this old boy. Now go and discuss it with your sovereign parliament who said you had to send it.”
3. “Under duress” - he’s the PM for heaven’s sake, he can resign or refuse to send it (and presumably under the Benn act be arrested or whatever). instead he took the weasel’s option, but it’s not a way out
4. The ball is purely in the UK’s court - it’s PM has sent an official letter, yet sent a personal letter refuting it. So he’s saying “I implore you to help me fix the mess in my own country” - that’s pretty much abject surrender by boris instead of being a man. Shame.