In Article 25A of the principal Scheme (mobility supplement)—
(a) for paragraph (3) there shall be substituted the following paragraph:—
(3) Subject to paragraph (4), a mobility supplement under this Article shall not be payable to a disabled person for any period in respect of which he has the use of an invalid carriage or other vehicle provided under any of the statutory provisions referred to in paragraph (1)(c)(i).
(b) after paragraph (3) there shall be added the following paragraph:—
(4) In a case where the Secretary of State is satisfied—
(a) that a disabled person has purchased or taken on hire, hire purchase or lease a private car or similar vehicle (in this paragraph called “ the car ”) for a consideration which is more than nominal;
(b) that the disabled person intends to retain possession of the car in order to learn to drive it; and
(c) that the disabled person will use a mobility supplement under this Article in whole or in part towards meeting the expenses of acquiring the car,
paragraph (3) shall not apply during such period as the Secretary of State may consider reasonable, beginning on the date of his acquisition of the car, or 21st November 1983, whichever is the later.