THE five architects in the competition constitute an unofficial salon des refuses, practices whose ambitious designs have been welcomed as far away as Cincinnati and Yokohama, but in the recent Lottery boom somehow lost out to the more established names of Foster, Hopkins, Rogers and Grimshaw. All five practices are led by women, either on their own or in partnership with men, a first for such a project in the masculine world of architecture. They are Zaha Hadid, Future Systems, Foreign Office Architects, Ushida Findlay and the Dutch practice, MVRDV.