He was educated at Street George"s School, Windsor Castle and Brighton College. He graduated from Worcester College, Oxford with a degree in Literae Humaniores in 1959 (Bachelor of Arts, Master of Arts 1961). During the following two years, Bavin completed his National Service in his father"s old regiment.
He was the bishop of Anglican Diocese of Johannesburg from 1974 to 1985. He was then Bishop of Portsmouth from 1985 to 1995. He was commissioned in 1958 and served as a Platoon Officer in Aden.
Returning to Oxford, Bavin studied for ordination at Cuddesdon College.
He was ordained deacon in 1961 and priest in 1962, spending the period 1961-1969 (and then 1973-1985) in South Africa. He was the first Chaplain of Saint Alban"s College, Pretoria, then a curate at Uckfield with Little Horsted and finally Vicar of the Parish of the Good Shepherd, Brighton from 1971 to 1973.
In 1973 Bavin became the dean and rector of the cathedral parish of Johannesburg as well as archdeacon of the diocese and, in 1974 at a turbulent period in that country"s history, its bishop, a position he was to hold until 1985. From 1985 to 1995 he was Bishop of Portsmouth, during which time he was appointed an honorary fellow of the Royal School of Church Music.
After resigning his bishopric he was professed as a monk of the Benedictine community at Alton Abbey.
As a result, Bavin has curtailed his involvement in the Athenaeum and the Royal Yacht Squadron, although he does occasionally preach at other Christian places of worship.
In 1987 he became a member of the Oratory of the Good Shepherd.