The architect who designed the Library of Birmingham is up for the Women in Architecture award. Dutch designer Francis Houben has been shortlisted by the Architects' Journal.
Last month the £193 million library was also voted building of the year by the publication's readers.
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She was last seen in Warwick earlier today.
A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
Tens of thousands of people are expected to line the streets this weekend.