law: Armed Forces Tribunal Act 2007 
  42. Power to make
  
  rules retrospectively
  The powers to make
  
  rules under section 41 shall include the power to make such rules or any of
  
  them retrospectively from a date not earlier than the date on which this Act
  
  shall come into operation but no such retrospective effect shall be given to
  
  any such rule so as to prejudicially affect the interests of any person to whom
  
  such rule may be applicable.