Got a further email from easyJet. It merely repeated that the claim did not qualify because of ATC restrictions. But they did not offer any evidence or proof (again). They then said that in their view the matter was closed. Can they do that? I am clear that it was an operational switch if aircraft that let to ours being cancelled. OK, maybe they switched it because they didn't want CPH passengers to claim (more expensive for them?) but in my view the aircraft switch was clearly in their control. Thoughts anyone or am I flogging a dead horse?