4(1)The transitional rate of a person’s state pension is to be increased under this paragraph if it exceeds the full rate.
(2)If at any time the full rate of the state pension is increased, the person’s transitional rate is increased (at that time) by the same amount as the amount by which the full rate is increased.
(3)If at any time an order under section 151A of the Administration Act comes into force, the person’s transitional rate is increased (at that time) by an amount equal to the appropriate percentage of the excess.
(4)In sub-paragraph (3)—
“the appropriate percentage” means the percentage specified in the order, and
“the excess” means the amount by which the transitional rate exceeded the full rate immediately before the order came into force.