Prime Minister David Cameron's Statement on Rowan Williams' Decision

From here:

“I would like to thank Rowan Williams for his dedicated service as Archbishop of Canterbury. As a man of great learning and humility he guided the church through times of challenge and change.

“He sought to unite different communities and offer a profoundly humane sense of moral leadership that was respected by people of all faiths and none.

“As Prime Minister, I have been grateful for his support and advice ”“ and for the work he has done around the world, particularly in Africa where he has taken such a close interest in Sudan. I wish Rowan and his family the very best for the future.”