The main challenge is technology and that's something I really push and work closely with Adidas on. They're real leaders in sports performance; always trying to push that further and further and get the best technology they can. That takes time and has rigorous testing, it's very laborious, but it's also very rewarding. You get to work with fantastic athletes, and that's a fantastic thing that has nothing to do with my day job in ready-to-wear.

There's nothing fashionable about a dead animal that has been cruelly killed just because some people think it looks cool to wear.

My biggest surprises in my everyday job have to do with the challenges of trying to be slightly more responsible as a brand.

Running is a huge category for us. To be able to run to work and have lightweight, breathable, windproof materials you can chuck in your bag that work on technical level but also on a lifestyle level are really important to me. I work out - and I think most people do - and I want to encourage women and inspire them in a way that fits in with their lifestyle.

I'd rather people turn up than not. And of course I'd rather have people be enthusiastic.

I think deep down I'm spiritual, but there's nothing I practice.

I don't use specific brands really. It's just that for my skin, I need as high an SPF factor as I can get my hands on. That's the only rule.