Who could replace English?

Rodney Hide writes:

Key put Collins back in Cabinet. He saw his previous leader Don Brash off and out of Parliament. He made National’s leader before Brash – Bill English – his number two.

And what a choice. English is the heart and brains of the Government. I consider him the best minister I’ve seen.

I agree.

There’s constant speculation on who might replace Key if National gets a fourth term. But just as important a question is who might replace English when he chooses to retire?

English is not just the Finance Minister of the Government, but effectively the Chief Operating Officer also. He is constantly looking at how to improve the performance of the public sector.