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Nikki da Costa is a former director of legislative affairs at No 10 who served under Boris Johnson until Sept 2021.

In an exclusive broadcast interview on 91¸£ÀûÉç Radio 4’s Woman’s Hour, Nikki da Costa explained to Emma Barnett why she was breaking her silence on the PM's conduct and the No 10 parties.

When asked by Emma Barnett who she thought was responsible for the culture in No 10, Nikki da Costa said it was Boris Johnson’s chief of staff, Dan Rosenfield.

Mr Rosenfield has been approached for a comment.

You can listen to the full interview with Nikki da Costa by heading to 91¸£ÀûÉç Sounds and listening to the 91¸£ÀûÉç Radio 4 Woman’s Hour episode from 31 January.