US architect Wimberly, Allison Tong & Goo has formed an alliance with two rivals to create one of the world's largest practices.
WATG, whose London's office has 50 staff, formed the alliance with US firms Callison Architecture and Thompson, Ventulett, Stainback & Associates earlier this year.

The move mirrors rival HOK's alliance with four European firms to share expertise and local knowledge, which was announced last month.

Cathy Tondelli, WATG's business development director, said this week that its British clients were benefiting from the range of skills on offer. Although they are not merging, the firms have agreed to work on projects together, share research and co-ordinate marketing.

Tondelli said the alliance was working on three projects around the world.