While serving in Belfast he introduced the Foreign Office to Christie Davies's humorous suggestion that Northern Ireland be the new home of Hong Kong's British population when the territory was handed over to China in 1997.

From 1994, he was 1st Secretary (Political/Information) in Seoul, and in 1996 he returned to London as Deputy Head of the Southern African Department.

In 1999, Fergusson became Consul-General in Boston, and in 2003 was seconded to the Cabinet Office as Head of the Foreign Policy Team.

[3] In 2006 he was appointed High Commissioner to New Zealand and Samoa, and Governor of the Pitcairn Islands.

[7] In May 2012, Fergusson took over as Governor of Bermuda from the retiring Sir Richard Gozney and served until August 2016.