The future of the former remains in doubt, while the latter project was scrapped by Rachel Reeves, the Chancellor, shortly after Labour won the general election in July.
Such about-turns mean Britain will give up ground as a leading global construction giant, according to Mr Wilkinson.
He said: “We just can’t have this flavour of the month, so to speak, [where we say] ‘we’ll build the fastest high-speed rail network in Europe’, and then all of a sudden we find ourselves six, seven years down the line or more and we’re only taking it to Birmingham.
“The industry has invested a huge amount in training and educating a workforce to deliver high-speed rail, which unfortunately, in my view, will now disappear across to other countries that have got committed programmes and have more certainty about them. That’s a complete waste because UK plc has invested in the training.”
Mr Wilkinson added: “We cannot keep going through these differences of opinion of what the UK needs. We should be able to plan and be more predictable.”
However, Mr Wilkinson added that the Government seems “to be willing to listen and that is a really important step change”.
This month, Darren Jones, the chief secretary to the Treasury, set out plans for a new National Infrastructure and Service Transformation Authority (Nista) to tackle delays to major projects and restore investor confidence.
Mr Wilkinson called on the Government to “make a plan and stick to it”, adding: “That will be really advantageous for international investment to come in.”