To then be on set [of The Flash] the next day over a meta human carcass talking about stratum corneum with Barry Allen, I was, like, fan girling out a little bit. I had to calm myself down a few times. But it makes it fun, coming in as a fan.

One thing that people keep on saying to me is that the wealth and the fame must have made up for missing out on my childhood. But the idea of money - putting a price on your childhood - is ridiculous. You will never get those years back and you can't put a price on them.

I have met a couple of six-year-olds who were apparently quite excited to meet me - before they actually met me. And when they actually met me they ran behind their parents' legs and cowered for shelter.

Those of you that think filming is all glamour, you're so wrong! Really, only the premieres are the glitzy bits.

People always tell me I'm nothing like my character. Well, hopefully not! He's a character who's very defined. He was purposefully written by Jo Rowling as very one-dimensional in the first few books, because you're supposed to hate him.

I had a great childhood.

I'd have to just say that working with other people, it's a different world from school.