While Mr Milburn used the post to plot Labour's election campaign, Mr Hutton was charged with chasing up reform and delivery across government.

BBC: Mr Hutton is seen as ultra-loyal to Tony Blair

He entered Parliament in 1945 in Labour's post-war landslide and became Speaker in 1976, a post he held until his retirement seven years later.

BBC: News | UK Politics | Speaker's memories go under the hammer

The post was previously held by the Labour Newport East AM John Griffiths.

BBC: The new CG and some raised eyebrows