I'm afraid I have to take issue with your premise 'Danidl' for this reason: The EU need do nothing at all as it is incumbent upon the UK to attend the long-awaited discussions or negotiations if that be the proper term. The EU is not expelling the UK from the union - it was the UK's stupid, self-serving PM who set this secession process in train. Your closing comment is an irrelevance as many would contend that the UK government were never equipped for the task at any time.As an act of humanity and decency, the EU parliment should \could
1. Publish it's negotiating principles on the website
2 make a single party application to the ECJ to nullify the letter of intent by the previous UK prime minister. The incoming UK government, can then either object to this , and demand that the original timetable be adhered to , acquiesce and in due course send another letter , or debate the matter further in your parliment and if common sense prevails repeal the act of folly.
Everybody knows that the UK is currently incapable of commencing negotiations.
Nothing has changed in terms of the leading players appointed by May and the government appears determined to carry on regardless. Therefore, I fail to see why the EU should extend a sort of act of charity towards the UK after the disgraceful way May & Co set their stall out after initiating the Article 50 procedure.
Essentially, it is business as usual so unless the PM should wish to offer the electorate another opportunity to state its preference via referendum, we'd best get on with matters as expeditiously as possible.
Tom