At the center of the Barclays mess (other banks including JPMorgan Chase, Citi, UBS and Bank of America are also being investigated) is an October 2008 conversation that took place between Diamond and Paul Tucker.
The MPs accused Barclays of trying to pull the wool over their eyes by publishing, before Mr Diamond's committee appearance, a note of a phone conversation between Mr Diamond and Paul Tucker, the deputy governor of the Bank of England.