In article 2(1) of the principal Order, for the definition of “full rate” there shall be substituted the following—

• “full rate” means the rate at which a pension might have been granted to an office holder if his service had continued to normal pension age, but calculated by reference to the annual salary attaching, at the date he ceased to hold office, to—

  1. a

     his last office; or

  2. b

     an earlier office of his where the amount of that pension would have been based on that salary, but if that office had ceased to exist before the date on which he ceased to hold his last office, the annual salary shall be taken to be such as the Lord Chancellor or the Secretary of State with the concurrence of the Treasury may determine it would have been had the earlier office continued to exist.