Boris Johnson's aides reportedly banned him from taking top secret documents home after confidential papers were left strewn around his flat.
Highly classified material, known as Strap documents, was allegedly found lying around in the Prime Minister's Downing Street flat and in the upstairs quarters at his Chequers retreat.
The PM's former top aide Dominic Cummings ordered a crackdown on intelligence documents being put in Mr Johnson's red box in early 2020 after becoming alarmed by the "frat house" atmosphere, according to the Sunday Times.