Small though it is, the human brain can be quite effective when used properly.
I like challenges that test your ingenuity.
I'm an actor. If you had said to me before I started acting that I'd get two bites of the cherry - you would do things that people will remember forever like 'The Brothers' which I did in the '70s and now 'Doctor Who' - I'd have been overjoyed and I still am.
I am a big man, but I've allowed my condition to deteriorate by being overweight.
I take every job on its merits.
It was lovely to do The Knock because I haven't done anything really significant since Doctor Who.