For the last episode [of Downton Abbey], you'll need some handkerchiefs. I needed handkerchiefs reading it. It wasn't because it necessarily moved me while reading it, but it was the experience of reading it when I realized it was the last time I was ever going to be reading one of those scripts. That was quite terminal.

At home I have a Tibetan terrier. I'm still not sure if he's a genius or very thick. It's a fine line.

To go to the White House is a once-in-a-lifetime opportunity. In fact, the building is not that big.

You have no idea what's going to happen [in Downton Abbey] until you get the script. We roughly knew a couple of the key points that were going to happen, but when I got the last episode, I turned to the last page to check that I was still alive.

In the age of the camera phone it's a bit weird when you're sitting having dinner in a restaurant and people think they're being very subtle taking a photo while in fact they're being very obvious. When you're in a middle of a mouthful with friends or family and people come up asking for a photograph, that's when you want to say, 'Actually, I'm going to say no; I'd like to finish my meal. This is my time.'

I have an excellent internal compass.

I had girlfriends, but settling down was the last thing on my mind.