I live in both London and New York.

My girlfriend [actress Erin Darke, 30] and I hop back and forth, so we’re constantly saying goodbye but looking forward to seeing each other. It’s quite a romantic state to be in.

1 The Harry Potter star is in a relationship with actress Erin Darke Credit: Francois Berthier/Contour by Getty Images

I do smoke and I like roll-ups.

I get a kick out of asking people for a light – I’m always losing lighters.

They fumble in their pockets, look up and realise they’ve committed the crime of giving Harry Potter cancer.

I’m not Harry Potter any more, but I don’t regret a day of it.

I had the time of my life.

Joanne [JK Rowling] has moved on to Fantastic Beasts.

Some friends are involved and I couldn’t be more thrilled for them.

I have a slightly lazy eye so I’m rubbish at selfies.

If I send one to my girlfriend, I take it about 10 times so I look decent enough that she won’t think I’m having a heart attack.

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People look at me with pity sometimes.

I know it’s because they think I didn’t have a childhood, that I was like a slave to the Potter set.

But it was fun hanging out with Emma Watson and Rupert Grint, and the most fascinating grown-ups like Alan Rickman, Julie Walters and Maggie Smith.

You don’t meet those characters every day and they were like family to me.

Most of my friends are actors or film-makers these days.

I have really thrown myself into this business.

I love it and want to stay acting and making films, even directing and producing maybe.

I’m lucky enough to be able to choose to do strange little films like Swiss Army Man or Imperium where I’m shown playing a neo-Nazi.

It’s really helping change the way people think of me.

I’d love to have worked with Peter Sellers in Dr Strangelove or David Niven in A Matter of Life And Death.

They’re two of my favourite films.

But in February I’m back on stage in Rosencrantz And Guildenstern Are Dead at London’s Old Vic and I can’t wait.

Swiss Army Man is out on DVD now. Daniel Radcliffe stars in Jungle out in 2017.