As if it wasn't enough of a mess :
UK must hold EU elections if Brexit is delayed, says senior MEP.
"The U.K. has a “duty” to hold a European Parliament election if Brexit is delayed beyond the poll in May, according to Polish MEP Danuta Hübner, who is a member of the Parliament's Brexit Steering Group."
Makes sense, they can't be without MP while still being in the EU. It seems that nobody expected it to be necessary, but now it's going to make it even harder for GB to ask for a delay. Nobody wants to organise and campaign for an election that will be useless a few weeks later.