The deal was agreed with RMJM eyeing growing demand for clean and secure energy supply, particularly nuclear power.

It also hopes to use YRM’s expertise to move into other technology intensive industries such as pharmaceuticals, high end manufacturing and transportation.

YRM chief executive John Clemow said: “We approached RMJM seeing the potential of a practice combining architecture, masterplanning, design and environmental engineering with over 800 staff and offices on four continents.

Joining RMJM provides the capacity, capability and reach our clients in the UK, EU and EMEA increasingly require.”

Peter Morrison of RMJM said: “YRM’s leading position in energy and technology related projects and our combined experience across a wide range of sectors, significantly strengthens RMJM’s offer in the global marketplace.”