[1] He entered training for the priesthood at the Venerable English College and was awarded a Licence in Dogmatic Theology by the Pontifical Gregorian University.

[1] He was ordained a Deacon whilst in Rome by Cardinal Basil Hume, the then Archbishop of Westminster.

He led the Bishops' Conference during the Papal Visit to the UK in 2010 by Pope Benedict XVI and was in interim charge of the Catholic Education Service after the resignation of Oona Stannard.

Stock attended Solemn Vespers on the eve of his consecration as bishop, where his episcopal insignia (ring, mitre and crozier) were blessed by John Wilson, the Diocesan Administrator (Vicar Capitular) for the Diocese of Leeds.

Stock issued a pastoral letter on 25 September 2016 on Sacramental Preparation for First Holy Communion and Confirmation and the Provision of Youth Services, changing the age at which the sacrament of Confirmation is generally conferred on young people from the age of 14 to 11,[3] with consequential changes to the ages at which young people generally first receive the sacraments of reconciliation and holy communion.