The latest flagship policy from her campaign may also be seen as a bid to steal a march on Mr Sunak, who has been an advocate of freeports since his days as a backbench MP and has used the contest to style himself as the “common-sense Thatcherite” candidate.
Five bids have been submitted to create green freeports in Scotland, including one proposed for the Firth of Forth off Leith.
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The plan from Ms Truss, seen as the candidate of the Tory right-wing and as the most popular with the grassroots, comes with fresh promises of reducing regulation and cutting Whitehall bureaucracy.
Pitched as the cornerstone of her tax-cutting economic vision, the Truss campaign said the plans would see brownfield sites and other locations turned into “investment zones”, dubbed “full-fat freeports”.
“As Prime Minister, I will be laser-focused on turbocharging business investment and delivering the economic growth our country desperately needs,” she said.
“We can’t carry on allowing Whitehall to pick the winners and losers; like we’ve seen with the current freeport model.”
Freeports became one of the flagship, post-Brexit policies for the Johnson Government, with several free ort locations announced by then-Chancellor Mr Sunak last year.
In a think-tank report in 2016, the then-junior Tory MP wrote: “Brexit will provide the UK with new economic freedom, and the Government should take the opportunity to create freeports across the nation.”
The aim is to boost economic activity near ports or airports, with the sites benefitting from tariff exemptions on imports.
Under her plan, Ms Truss said the investment zones would benefit from a low-tax burden, reduced planning restrictions and regulations tailored on a case-by-case basis.
She also ties the plan into Mr Johnson Government’s levelling-up pledge, claiming the investment zones will create new model zones akin to Saltaire and Bournville.
In what might be seen as an implicit criticism of the former chancellor’s record, Ms Truss also says she will reform current Government policy to “unleash the potential” of existing freeports.
“By creating these new investment zones we will finally prove to businesses that we’re committed to their futures and incentivise them to stimulate the investment that will help deliver for hardworking people,” she said.