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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 ÃÛÑ¿´«Ã½ 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 ÃÛÑ¿´«Ã½ Sounds and listening to the ÃÛÑ¿´«Ã½ Radio 4 Woman’s Hour episode from 31 January.