Downton Abbey star Laura Carmichael, who plays Lady Edith, is making her West End debut alongside Anna Friel in a production of Uncle Vanya at the Vaudeville Theatre.
Our correspondent Lucrezia Millarini went along to meet her:
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The man is believed to have suffered a fractured cheekbone.
The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
If you're dreading going to work Monday morning, how about this for a career change.