Did anyone else think David Bradley did a great job portraying William Hartnell?

Indeed I did. I was 7 years old when I saw the first episode of Doctor Who, and remember writing in my diary a year later my astonishment that it was still going.

He played it well. Hartnell's doctor was a bit prickly and hard to live with. Perhaps explains why he had to wander around the universe on his own, and going through a series of companions. I was never aware how sick he was - he seemed a timeless old man who went on forever, yet vigorous enough to take on anything. David Bradley captured this very well.

They've just had the 13 Doctors episode, and I suspect and hope that we'll see more of Doctor 4 (Tom Baker), the earliest with the original actor still alive, who appeared as The Curator. There is an interesting story line, since it was Doctor 3 that was banished by the Council of Gallifrey, but was restored to the Tardis then, but later perished and regenerated into the fourth, who was summoned to Gallifrey. It is right that this Doctor, now The Curator, that holds they key to the future of Gallifrey, frozen in time to avoid annihilation. It could be that The Curator, as an old man, was rewarded by being allowed to relive as a regenerated Doctor in a younger body, in which he became President of Gallifrey. In defiance of the law of time, the older Curator would have memories of his time as the Doctor, even though they had not happened yet, but would be somewhat confused by them. I am making it up though; Stephen Moffat may have different ideas.

I think that if they ever reprised the First Doctor, they could use David Bradley again, perhaps in a prequel to explain how the Doctor got to that junk yard in London in the first place, why the Tardis's chameleon circuit broke (which he's been trying to fix ever since), and how he managed to have a grand-daughter, and was she of the race of Time Lords herself. If she was, and she was still on Earth at the time Gallifrey was frozen in time, and if she had not herself regenerated, we have an old lady who had forgotten her capabilities (having been abandoned long ago to live out her days as a human), and that the statement made by the 10th Doctor (Eccleston) that he was the last of the time lords was in ignorance.