[5] Having attended the College of Law, Guildford, he qualified as a solicitor and worked in the City of London.
[2][8] He contributed a chapter to Journeys in Grace and Truth: Revisiting Scripture and Sexuality, a book of essays from Anglican evangelicals who hold a positive view of same-sex relationships.
[12] In November 2022, Collins endorsed Steven Croft's call that clergy in the Church of England should be free to bless or marry same-sex partners and to enter into a same-sex marriage themselves;[13][14] this is in contrast to the Church's current official position.
[15] 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".
He has a twin brother who is an Elder in the Baptist Church and a sister who is a Methodist Lay preacher.