I have twice had flights cancelled departing LHR on CX and I always travel in BUsiness class.The service I got from CX was truly awful and frankly speaking they did everything they could to keep everybody at the aiport and did not even provide any vouchers for food or drink and were telling people to go back where they had come from and come back tomorrow, the LHR staff were amongst the worst I have ever dealt with in this kind of situation which I have to say I have had lots of experience over the years with delayed travel