Reid Architecture and 3D Architects are to merge to create a single practice called 3Dreid. Charles Graham-Marr, the current director of 3D will be chairman of the new company, which will have 320 employees and offices in Birmingham, Edinburgh, Falkirk, Glasgow, London and Manchester. 3DReid, is expected to have a turnover of around £20m a year.

“We are delighted to be creating such a strong organisation in its geographical spread, design talent, depth of resources and range of knowledge and expertise,” said Graham-Marr.

Both practices have a strong Scottish base – 3D’s high profile developments include the City Holdings’ headquarters in Glasgow while the Edinburgh Air Traffic Control Tower is one of Reid’s prize-winning projects.