David Bradley on why he jumped at the chance to play William Hartnell 

David Bradley was magnificent as William Hartnell. The scene where he said "I don't want to go. I don't want to go!" was even more heartbreaking than David Tennant's regeneration. Seeing that stern, grumpy, prideful and passionate old man sobbing in his wife's arms as he was forced to accept the reality that he would no longer be playing his most cherished role was devastating to watch. Some people may think of David Bradley as the hammy Argus Filch. For a long time, I thought of him like that too. But his performance as William Hartnell was so drastically different from Filch and filled with so much heart that I think it's the role he should be most proud of, especially because he wasn't just playing a character. He was playing a man who lived and breathed in our world, not a fictional one.

When it comes to reboots, in the anniversary year I think a spinoff with David Bradley playing the ‘Hartnell’ Doctor would be fantastic. Maybe using material from books like Doctor Who Witch Hunters by Steve Lyons, Byzantium by Keith Topping or City at World's End by Christopher Bulis, or remakes of the lost Hartnell era series from the 1960s, such as Marco Polo, The Myth Makers, The Daleks' Master Plan or The Savages.

His portrayal really filled my heart with all the feelings. The ending where he has to give up the role he created because of his bad health just broke my heart.

My biggest problem with the David Bradley version of The Doctor in the actual series (rather than the docu-show) was that they wrote him as both a racist and a misogynist in "Twice Upon A Time". In the original run, The Doctor never treated his female companions as anything other than equals.