law: Government Securities Act 2006
  21.
  
  Discharge in respect of interest on Government securities. -
  Save
  
  as otherwise expressly provided in the terms of a Government security, no
  
  person shall be entitled to claim interest on such security in respect of any
  
  period which has elapsed after the earliest date on which demand could have
  
  been made for the payment of the amount due on such security.