The Enquirer has been contacted by specialists who have had their vans pulled over since the Government’s lockdown measures started.

And Willmott Dixon subcontractors are being issued with letters to show police confirming there is currently no Government instruction to shut sites in England.

An internal email sent to Willmott Dixon staff and suppliers seen by the Enquirer states: “It has come to our attention that some of the people working on our sites have been stopped by the police who have questioned whether their travel to work is essential, and at least one of these incidents has resulted in a fine.

“The Government has sent a clear message, it wants construction sites to stay open as they are an important part of our working economy and a major catalyst for regional and national growth.

“With that in mind my recommendation to prevent further police stops and possible fines is for your workforce to carry a copy of the attached letter along with their CSCS card.”

One London specialist said: “One of our vans was pulled over this morning on its way to a major site which is still working.

“Officers asked where they were going and said that doesn’t sound like essential work and they would be fined next time they were stopped.

“We are working for a major contractor in London who expects us to come in.

“It just highlights the mixed messages at the moment.

“Government seems to be saying carry on but then police are saying another thing.

“I think they should shut most sites until after Easter for a complete rethink on this.”

Police have new powers to issue £60 fines for those deemed to be making non-essential  travel.