(1) Where a member is entitled to any allowance under regulation 3 hereof there shall be payable to him in addition all fares and other locomotion expenses actually and reasonably incurred in travel, including expenses incurred in the provision of first-class accommodation by railway, ship, motor vehicle, or other public conveyance plying for hire on the route traversed, and ordinary sleeping berths on trains and deck cabins on ships.
(2) Where the journey or any part thereof is served by more than one means of public conveyance, then, whichever means be used, the member shall be entitled only to the locomotion expenses payable for travel by the least expensive of those means of conveyance:
Provided that locomotion expenses in respect of any alternative means of public conveyance may be paid, when by reason of saving of time the total expense to the Board (including cost of transport and any allowance under regulation 3 hereof) does not exceed the total that would have been payable had the least expensive of the alternative means of conveyance been used.