The council already allocated $5000 a year to the chief executive's professional development, but the decision saw that sum increase to $15,000 a year for 2014-15 and 2015-16.
That allowed Dr Bidrose to take four week-long trips - in February, April, July and last week - to study towards a graduate diploma in organisational leadership at Oxford University's Said Business School.
The course focused on leadership decision-making, team-building and organisational design, and was limited to 38 places, she said.
This year's course drew top international managers from airlines, the military, governments, the United Nations and media companies.
However, Dr Bidrose said she also had "skin in the game" - paying another $40,000 herself towards course costs, accommodation and half the economy class flights to and from England, while the council picked up the rest.
She also used annual and study leave entitlements for the trips, and completed correspondence-based course components in her own time from Dunedin.
"It was a signal that I genuinely felt it was a piece of professional development worth doing."
Mr Cull said he was comfortable with the investment, which would add a top-level "business perspective" to the running of the council.