Fortunately I didn’t play their ridiculous game. While everyone else on my flight got shouty, I booked onto BA out of Heathrow early the following morning and got home many hours faster than easyJet could have offered on their own services. Claim is still pending but my understanding is they will be required to reimburse the significant fare difference, my transport to Heathrow and my overnight accommodation.
Good luck with that
Of course, not everybody has the resources to be able to take that action for themselves.