In 1986, Cockett entered the Aston Training Scheme to prepare for ordination. This was a two-year part-time scheme that was led by Laurie Green and aimed to prepare its students for theological college. He studied theology at Oak Hill College, a Conservative Evangelical theological college in London, and graduated with a Bachelor of Arts degree in 1991. Cockett was ordained in the Church of England as a deacon on 30 June 1991 by John Waine, the Bishop of Chelmsford, and as a priest in 1992. From 1991 to 1994, he served his curacy at St Chad's Church, Chadwell Heath, an Evangelical church in the Diocese of Chelmsford. In 1994, he joined St Paul's Church, Harold Hill. He served as an assistant curate from 1994 to 1995, as priest-in-charge from 1995 to 1997, and then vicar. In 2000, he became Team Rector of Billericay and Little Burstead. From June 2004, he was also the Rural Dean of Basildon. In addition to his parish ministry, Cockett worked as a chaplain. For 20 years, from 1992 to 2012, he was Chaplain to West Ham United F.C. During the 2012 Summer Olympics held in London, he was chosen as one of the 193 multi-faith chaplains, and he ministered to the athletes and officials of the games. In June 2007, it was announced that Cockett would be the next Archdeacon of West Ham. He took up the appointment in October 2007 in succession to Michael Fox. His archdeaconry originally covered the London boroughs of Barking and Dagenham, Havering, Newham, Redbridge, and Waltham Forest; since the creation of the Archdeaconry of Barking in 2013, it has covered Newham, Redbridge, and Waltham Forest. In September 2014, he additionally became the Chair of the Chelmsford Diocesan Board of Education which oversees 140 church schools. Though he attended a Conservative Evangelical theological college, Cockett has identified himself within the Open Evangelical tradition of the Church of England.
Other work
Outside of his ordained ministry, Cockett is involved in charity work and is a school governor. Since January 2008, he has been a trustee of Aston Mansfield, a charity centred on the London Borough of Newham. He is also a trustee of The Reverend Doctor George Richards' Charity For Poor Clergymen, a charity that assists Church of England clergy who have retired early due to ill health and their families. Since 2011, he has been a governor of Forest School, Walthamstow.
Personal life
Cockett is married to Sue, who he met while he was performing in a play at Forest School. Together, they have three children; Sarah, Rachel, and the opera singer Thomas Elwin. Cockett is a fan of West Ham United F.C. He is a keen musician, having held a music scholarship at Forest School and having been a boy chorister at St Paul's Cathedral. He is a member of the Dry Bones Band that occasionally plays "at events in Chelmsford Cathedral". He is also interested in motorcycling.