15.—(1) A person shall not supply gas through a primary meter installed after the coming into operation of these Regulations or for the first time supply gas through an existing primary meter after the coming into operation of these Regulations unless he ensures that a suitably worded notice in permanent form is prominently displayed on or near the meter indicating the procedure to be followed in the event of an escape of gas.
(2) Where a meter is installed in any premises at a distance of more than 2 metres from, or out of sight of, the nearest upstream emergency control in the premises, a person shall not supply or provide gas for the first time through the meter unless he ensures that a suitably worded notice in permanent form is prominently displayed on or near the meter indicating the position of that control.