Seshan joined Laing O’Rourke last January taking up the post of  group asset optimisation and supply chain director.

A company statement said: “Asset and supply chain optimisation remain fundamental to our strategy and we will now identify a successor to drive forward the platform developed by Roger and the wider team.

“We would like to place on record our thanks to Roger for his many contributions and wish him further success in the future.

Seshan, a qualified corporate lawyer, left to focus on project development in the power sector reflecting previous senior roles in renewable, thermal and nuclear power.

Before he worked with Scottish Power on large-scale infrastructure transactions, project structures and regulatory frameworks, covering renewable, gas and coal-powered generation.

During his time as one of eight senior board members at O’Rourke he pushed the firm’s extensive optimisation agenda delivering improved common principles and approaches in policy deployment, intellectual property management and supply chain management.