Almost 500 firms have so far signed up to attend HS2 two supply chain conferences being held in London and Manchester.

Construction is planned to start in 2017 but works procurement could start to get underway next year.

HS2 Chief Executive, Simon Kirby said: “Building HS2 is a massive, long-term project – one that offers huge opportunity for large and small companies right across the country.

“To construct it; and then bring it to life will require a vast range of skills and expertise, some of which we have and some we’ll need to develop.

He added: “To deliver a project of HS2’s scale and complexity we are committed to working with companies who share our collaborative values.

“We are also determined to build on Crossrail’s success where 97% of contracts were placed with UK-based firms.”

“So, I am extremely pleased that so many firms have already shown an interest in helping to deliver HS2. I would encourage all firms large or small to get involved.”