(1) In the circumstances prescribed by paragraph (2) the value of the appropriate percentage shall be reduced by the amount prescribed by paragraph (3).
(2) The circumstances prescribed by this paragraph are circumstances where the car—
(a) is first registered on or after 1st January 1998,
(b) is a bi-fuel car either—
(i) on the date on which it is first registered, or
(ii) by virtue of equipment added after the date on which it is first registered, and
(c) is not a car to which paragraph 5 of Schedule 6 applies.
(3) The amount prescribed by this paragraph is 1%.