Thanks Daysleeper,
Now is that because the aircraft were delivered with the mod already completed by BA, or was it done by DHL?
I find one or two of our older 75's extremely noisey on the flight deck and have found from previous experience on a different type, it is much less fatiguing to use ANR headset on a long sector - not something you have to worry too much about I'm sure. I also suffer from high tone deafness in one ear.
What I'm trying to ascertain is how many other airlines have gone through the, not inconsiderable, expense of fitting them as my own is very reluctant to.
Many thanks