London: Dominic Cummings, the controversial brains behind the 2016 campaign for Britain to leave the European Union, on Friday stepped down as Prime Minister Boris Johnson's top aide.
Cummings was due to leave at the end of the year, reports said, but he was seen walking out of Johnson's 10 Downing Street office on Friday carrying a cardboard box.
A government source confirmed he would no longer be officially employed from "mid-December".
