Regulation 25
An authority may require an operator—
to recognise and accept any particular form of ticket, voucher, token or pass issued by the authority;
to display on his vehicles a sign or other identifying mark of a size sufficient for its purpose showing that concessions are available on those vehicles.
An authority may not require an operator—
to allow passengers, either generally or of any particular description, to travel on his vehicles without purchasing a ticket or possessing (as appropriate) a voucher, token or pass;
to use a particular type of vehicle to provide services on which travel concessions are available;
to reserve a specified number or proportion of the seats on his vehicles solely for use by persons eligible to receive travel concessions.