Nikki da Costa is the former director of legislative affairs at No 10 Downing Street. She served under Theresa May and Boris Johnson and was pivotal in the government's wrangles with Parliament over Brexit. On the podcast, she talks to Katy about why she and David Davis didn't quite get on; why she quit May's government and rejoined under Johnson; and what it was like to carry through her brainchild - the prorogation of Parliament - under scrutiny from the entire country and, eventually, the Supreme Court.