Duff trained for
ordained ministry at
Wycliffe Hall, Oxford, an
evangelical Anglican theological college. She was
installed as the eighth suffragan Bishop of Lancaster in July 2018 during a service at Blackburn Cathedral.
Views Duff is an
evangelical Anglican. She was involved in the Church of England's "Living in Love and Faith" (LLF); discussions relating to "matters of identity, sexuality, relationships and marriage". She was also involved in
The Beautiful Story, a film released by the
Church of England Evangelical Council in response to LLF which championed the Church of England's traditional teaching on sex, sexuality and
same-sex relationships. In 2023, following the news that the House of Bishop's of the Church of England was to introduce proposals for blessing same-sex relationships, she signed an open letter which stated: During the Church of England's February 2023
General Synod meeting, Duff was one of four bishops in the house to vote against the successful proposal to introduce blessings and prayers for same-sex relationships. She also voted against introducing "standalone services for same-sex couples" on a trial basis during a meeting of the General Synod in November 2023; the motion passed. Despite being an "outspoken opponent of the introduction of blessings for same-sex couples in the Church of England", she took part in the laying on of hands during the consecration of
David Morris as a bishop in the Church in Wales: he is engaged to marry a man but the Church in Wales allows its clergy to enter into same-sex marriages. ==Personal life==