Autumn Statement: An insider's guide

How does the Treasury put together a big set-piece economic announcement like a Budget or Autumn Statement?

Someone who should know is Rupert Harrison, who was chief of staff to former chancellor George Osborne.

He now works as a managing director at BlackRock in the City of London, where BBC News caught up with him to get an exclusive insider's guide.

Producer: Mark Broad Video Journalist: Dougal Shaw

  • Business