Failing that you might get it on iTunes (though of course you would have to pay for it).
Worth noting too, if it goes on 4OD, you will most likely have to wait a few hours after the GMT end time of the program for it to be posted. There's also an interesting looking program on re-creating WW1 dogfights called Fighting the Red Baron, might give that a watch tomorrow and post the link if it's any good...