From 1969 until 1975 he was a youth club leader and Assistant Minister, working in Glasgow for the Trinity College Missionary Society. He was ordained to the ministry in December 1970.
In 1975 he was called to St Andrew's Lhanbryde Church, near Elgin, Moray. He was Moderator of the Presbytery of Moray in 1985-86 and also a part-time hospital chaplain in Elgin.
In 1987 became minister at Renfield St Stephen's Church in the city centre of Glasgow. He was Moderator of the Presbytery of Glasgow in 2000-01. From 2002 until 2008 he was Clerk to the Presbytery of Glasgow. He has also served the Church of Scotland at a wider level, including serving on the Assembly Council and the Board of Social Responsibility. He has also taken part in study tours with Christian Aid to the Philippines, Malawi and South Africa. He was Turnbull Trust preacher at Scots' Church, Melbourne November 2010 to January 2011. Mr Lunan and his wife, Maggie, have four adult sons.[2]
