[2] From 1991 to 1993, he trained for ordination at Ridley Hall, Cambridge, an evangelical Anglican theological college.

[7] His most recent posts prior to the episcopate, since 2002, were as Anglican chaplain to the University of Surrey and a canon residentiary at Guildford Cathedral.

[6] In 2007, he became co-ordinating chaplain at the university[6] and was appointed the Bishop of Guildford's Advisor for Inter-Faith Relations.

[17] In November 2022, in response to the Church of England's Living in Love and Faith process, Frost stated "I am arguing for positive change which would enable us, as a Church, to bless, recognise and encourage signs of God's grace, presence and holiness in relationships between same-sex couples".

[18] In November 2023, he was one of 44 Church of England bishops who signed an open letter supporting the use of the Prayers of Love and Faith (i.e. blessings for same-sex couples) and called for "Guidance being issued without delay that includes the removal of all restrictions on clergy entering same-sex civil marriages, and on bishops ordaining and licensing such clergy".