Ivan
The test flights are being done from a commercial standpoint and not to help gather information which may be valuable both in safe operation now and in the future. The current flights are designed to prove that is is safe to operate in various conditions and not to gather meaningful data for any future operations should such a restriction be placed again.
I think the value of the Spey engines is miniscule compared to the amount of money lost every day.
It was just an idle thought, anyway. A desire to see the Rod have one last fling, one last (and this time more visible) chance to save the nation.
I resent 14greens and neildo implying that I might want to jeopardise crews, I've had enough friends not come back to not want to do that.