Despite having been under seemingly constant attack from the Coalition for the last three years, Ken Henry served most of his time as Treasury Secretary in the Howard government, having been appointed in 2001 and reappointed in 2006.

That was before he blotted his copybook in the eyes of the Liberals by telling colleagues about how shoddy the policy process within that Government had become, referring specifically to the Howard-Turnbull back-of-the-envelope Murray-Darling Basin plan.