The 585 page draft Withdrawal Agreement of 14 November, aka TMPM's deal, says EU law applies for 2 more years but the UK doesn't participate in the Institutions during that time. So, no EU elections in the UK in May 2019.

The perfectly real, not rumoured, EU no deal plan, of 13 November, says nothing about Institutions because it doesn't need to because no deal means the UK is out, of everything, from midnight 29-30 March 2019. 

The transition period happens by agreeing to the Withdrawal Agreement.

YOU'RE. WELCOME.

Ronsun it must suck arse to be in aposition where u have to know this shyt

Heh @ronsplaining.

Let me continue ronsplaining. I didn't bother answering the bit of yr q about the Withdrawal Act because the Withdrawal Act doesn't cause the transition period to happen or govern UK participation in the Institutions. It doesn't do anything. It is just the UK chatting away to itself internally about something that is about to happen to it by operation of something external, viz the EU treaties.

Yes it is tedious paying attention to this stuff. I am however buoyed up by the knowledge that unlike you I am hedged left right and centre from anything that may happen.

Ronald is correct.

The transition period is something which only happens if there is a deal. If we leave with no deal there is no transition period. We just crash out of the EU at 11pm.

Nobody cares what domestic UK legislation says. The transition date is produced by operation of the treaties, or agreement with the EU. If the UK is talking to itself and saying something inconsistent with the treaties or international agreement, that's an internal mess which doesn't affect what actually happens.

Ok now I understand the original question. You are wondering whether changing facts in the outside world will magically invisibly amend the Withdrawal Act, as it sits on its shelf in HMSO, perhaps by the words rewriting  themselves as in a Terry Pratchett plot.

No, in my opinion not.