Paul Kissack has taken the role of Treasury head of communication, replacing Damian McBride, who has become a special adviser to Brown. McBride remains a spokesman for Brown on party-political and personal issues.
The changes, unveiled in the wake of Labour's third election victory last Friday, see Kissack - who moves from a job as Treasury head of news - take charge of a ten-strong Treasury comms team.
At 29, he becomes principal spokesman on economic and policy issues.
Brown's handling of the economy has been widely cited as a principal reason for the electorate's sustained faith in Labour.
- The Blair/Brown relationship was more interesting than the election result itself, according to a survey of 20 European foreign correspondents.
There was 'unanimity' that Labour ran the best PR campaign, according to the poll, commissioned by GCI UK.