When they were broadcast on US television, I viewed both The Lost Prince and My Son Jack, years ago.
The embarrassing thing is that it was only just now, reading this thread, that I saw the connection. One of the messages on this thread was kind enough to spell out that the King, talking about coming upon the body of his son at the end of My Son Jack, was speaking of The Lost Prince himself. So ignorant am I of English history that this had to be spelled out for me; when watching the actual programs, this went straight in one ear and out the other.   

Both programs were admirable and I recall both of them with gratitude.