Whenever the lion fish in the fish tank in the captain's ready room died it was always a sad moment.

I've often reflected on this in the past weeks as I've been following the presidential campaign: Very often, I thought it would have been great for both of these guys to sit down and be force-fed a couple of dozen episodes of Star Trek.

I wasn't campaigning for a role in a Hollywood television series, it was a fluke. So you've got to have a measure of good luck, you really have, being in the right place at the right time.

I heard police or ambulancemen, standing in our house, say, 'She must have provoked him,' or, 'Mrs Stewart, it takes two to make a fight.' They had no idea. The truth is my mother did nothing to deserve the violence she endured. She did not provoke my father, and even if she had, violence is an unacceptable way of dealing with conflict. Violence is a choice a man makes and he alone is responsible for it.

I've been a witness to unfairness in society all my life. To the conditions under which my mother worked all her life, working in an industrial weaving shed in the north of England. And it has been this feature of unfairness that has motivated me in all of my political thinking.

As the captain, I was going to be having the dominant role in most of the episodes, and that was appealing. I wasn't interested in coming to Hollywood to sit around.

But as I grew up as a child, falling in love with the theater and Shakespeare, my heroes were Sir Laurence Olivier and Sir John Gielgud.