A vehicle which is temporarily brought into the State may be exempted by the Commissioners from the requirement to be registered, in such manner and subject to such conditions, restrictions and limitations as the Minister may prescribe by regulations made by him under section 141 if the vehicle is -

(a) brought into the State by a person established outside the State for his private or business use,

(aa) brought into the State by an individual established in the State for such individual's private or business use where such individual -

(i) is employed by an employer established in another Member State who provides a vehicle as part of their contract of employment, where such vehicle is owned or leased by the employer, or

(ii) is self-employed and has established a legally accountable undertaking in another Member State, whose business is carried on solely or principally in another Member State,

and where the vehicle is a category A vehicle or a motor-cycle, it is used principally for business use in another Member State.

(b) brought into the State solely for the purpose of a competition, exhibition, show, demonstration, or similar purpose and is not intended to be sold or offered for sale in the State and is intended to be taken out of the State on the fulfilment of such purpose, or