In the not-for-profit world, I never felt that being female was an impediment. I was, however, given my break into commercial theatre by a female producer, Judy Craymer, and women - in particular, Donna Langley, president of production at Universal - were crucial in giving 'Mamma Mia' a home in Hollywood.

I think Margaret Thatcher was a superstar in this country, and I think we all felt we needed a superstar to play her, somebody of huge intelligence, passion, and power and warmth.

In management terms, directing opera certainly prepares you for a film set: the magnitude of it, the experts in other fields that you have to call on. Both are massive ensemble jobs in which there's incredible pressure to get things done on time and on budget - so much so that making the wrong decision may be better than making no decision at all.

I didn't really realize I was a woman director until I walked onto the set at Pinewood Studios when I did 'Mamma Mia!' and everybody was calling each other 'Governor' and 'Sir'... and then, looking at me, 'Well... good morning!'