2.  Every private hire bus operating under the Bus-Plus Scheme shall be exempted from section 101 of the Act to the extent that it shall not be required to be licensed as a taxi when it plies for hire on any road and is hired under a contract, expressed or implied, from any taxi stand, taxi stop or through a prior booking, for the use of such private hire bus as a whole or for the use of two or more persons who pay separate fares.