The accountants have been crunching Government numbers from the ONS.

They discovered 10% of the current construction workforce was born in European Economic Area (EEA) countries.

That rises to 30% in London which will be hit hardest by any fall in migration.

The report states: “London’s construction sector could be particularly hard hit by reduced EU migration: 30% of construction workers in London were EEA migrants in 2016, while a fifth of UK-born construction workers in the capital are due to retire in the next five years and there are currently around 60,000 vacancies in the industry in London.”

PwC believes the government should pay special attention to construction in its Brexit strategy.

John Hawksworth, chief economist at PwC, said: “Limiting migration from the EEA could disproportionately impact some sectors and regions.

“By identifying the industries and areas that could be worst affected, the government can make informed decisions on post-Brexit migration policy and target their support accordingly.