20(1)A vehicle (other than an ambulance within the meaning of paragraph 6) used for the carriage of disabled people by a body for the time being recognised by the Secretary of State for the purposes of this paragraph is an exempt vehicle.
(2)The Secretary of State shall recognise a body for the purposes of this paragraph if, on an application made to him in such manner as he may specify, it appears to him that the body is concerned with the care of disabled people.
(3)The issue by the Secretary of State of a nil licence in respect of a vehicle under this paragraph is to be treated as recognition by him for the purposes of this paragraph of the body by reference to whose use of the vehicle the document is issued.
(4)The reference in sub-paragraph (3) to the issue by the Secretary of State of a nil licence is a reference to the issue by him in accordance with regulations made by him under this Act of a document which—
(a)is in the form of a vehicle licence, and
(b)has “Nil” marked in the space provided for indicating the amount of vehicle excise duty payable.
(5)The Secretary of State may withdraw recognition of a body for the purposes of this paragraph if it appears to him that the body is no longer concerned with the care of disabled people.