She was born in 1973 at the Lindo Wing of St Mary's Hospital, London,[1] the daughter of Sir Reginald Sheffield, 8th Baronet, and Annabel Jones.
[2] She attended the University of East Anglia where she studied English, and in 1995 won the Student Journalist of the Year.
[11][12] After Vogue, she founded a "positive news" app, #ThisMuchIKnow, with the help of a £60,000 government grant, but it struggled to find an audience and she had difficulties retaining key staff.
[3] In 2022, Sheffield became a regular panellist on The News Desk with Tom Newton Dunn,[15] and guest co-hosted Piers Morgan Uncensored,[16] on TalkTV.
[19] In 2013, she accidentally shared a pre-wedding photo on Instagram of her sister Alice with David Cameron, then the prime minister, in the background, asleep on a bed, with a ministerial red box beside him.