Sir Anthony Seldon is set to release his latest political biography, ‘Truss at 10: How Not to be a Prime Minister’ on 29th August, covering the turbulent 49 days that Truss was in the top seat.

The book is expected to contain some bombshell revelations about her time in charge, including insight into how she proposed to deal with the fallout from her disastrous mini-budget, which sent financial markets into a death spiral.

It also claims that Sir Jacob Rees-Mogg tried to persuade Truss to make him chancellor instead of Kwasi Kwarteng, and that he urged her to abolish inheritance tax, replace all tax rates with a 20p flat rate, and organise a stunt to promote nuclear power.

Seldon writes that the then cabinet minister told Truss: “We should get a nuclear submarine to dock at Liverpool and plug it into the grid. That would show it is safe.”

Sir Anthony says cabinet secretary Simon Case dismissed the idea as a “non-starter”, adding that “the subs are needed in operations”.