JW411 suggests:So Sean (with whom I flew on Belfasts) tells us that it cost £23 million to operate XH558 over 8 years. He also tells us that she flew 346 hours over that period. My cheap Russian calculator tells me that this comes in at just under £66,500 per hour.
Well, it is not cheap but mentioning that a C-17 is a quarter of the cost makes it seem good value.